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web.dev
  • ๐ŸŒweb.dev
    • ๐Ÿšงtodo
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    • ๐Ÿ—’๏ธtemplate
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    • ๐Ÿ“—reference
      • ๐Ÿ“˜JS spec
      • ๐Ÿ“™javascript.info
      • ๐Ÿ“™Eloquent JavaScript
      • ๐Ÿ“™JavaScript: The Definitive Guide
      • ๐Ÿ“—book
        • ๐Ÿ“—You Don't Know JS: series (v.1)
        • ๐Ÿ“—You Don't Know JS: series (v.2)
          • ๐Ÿ“—YDKJS: Scope & Closures (v.2)
        • ๐Ÿ“—Functional-Light JavaScript
      • ๐Ÿ”ฐwebsite
        • ๐Ÿ”ฐfreeCodeCamp
    • โค๏ธfav
  • โš™๏ธtools
    • ๐Ÿ”ฐtooltip
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  • ๐Ÿ”ฐHTML
    • ๐Ÿ”ฐelement
      • ๐ŸŽ›๏ธ<select>
      • <form>
      • ๐Ÿท๏ธ<hr>
      • <figure>
      • <input>
        • type="range"
        • type="radio"
    • block vs. inline
    • Semantic Elements
  • ๐Ÿ”ฐCSS
    • โญbox model
      • height
      • border
      • outline
      • ๐Ÿ”ธmargin
        • layout with margin
        • default margin
        • ๐Ÿ”ธnegative margin
        • margin collapsing
      • ๐Ÿ’Šbox-sizing
    • ๐Ÿ”ฐlayout
      • ๐Ÿ”นposition
        • ๐Ÿ”ธpositioned ancestor
        • ๐Ÿ”ธnearest positioned ancestor
      • ๐Ÿ”นtop
      • ๐Ÿ”นdisplay
        • ๐Ÿ”ธblock
          • inset
        • ๐Ÿ”ธinline
        • ๐Ÿ”ธflex
          • ๐ŸšงFlexbox
            • flex-wrap
            • justify-content
            • align-content
            • flex
            • container properties
          • ๐Ÿ”ธflex-direction
          • ๐Ÿ”ธalign-items
        • ๐Ÿ”ธinline-block
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        • ๐Ÿ”ธnone
      • ๐Ÿ”ธformatting context
      • Layout System
        • Lorem
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      • โœจexamples
        • Email Form
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      • vertical-align
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        • center with "transform"
        • center with "flex"
      • Block Formatting Context
    • ๐Ÿ”ฐvalues
      • ๐Ÿ”ฐunits
        • ๐Ÿ”ฐ็›ธๅฐๅ–ฎไฝ
          • ๐Ÿ”ธpercentage (๏ผ…)
          • ๐Ÿ”ธrem
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      • ๐Ÿ”ฐcolors
        • HSL
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        • radial-gradient()
    • ๐Ÿ”ฐvariables
    • ๐Ÿ”ฐfunctions
      • ๐Ÿ”นcalc()
    • ๐Ÿ”ฐselectors
      • select direct children by JS
      • basic selectors
      • attribute selectors
      • ๐Ÿ”ฐcombinators
      • pseudo-class
      • ๐Ÿ”ธpseudo-element
      • custom selectors
    • ๐Ÿ”ฐproperties
      • get/set CSS props
      • Logical Properties
      • overflow
    • ๐Ÿ’กTips
    • CSS import
    • Responsive Design
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      • CSS reset
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      • styling <details>
      • undefined tag
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    • Cascade
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    • Stacking Context
    • Font
      • Font Awesome
      • font-family
    • Text
    • List
  • ๐Ÿ’JS
    • ๐Ÿ’กtips
      • fill 2D array
    • ๐Ÿงštechnique
    • โญfeature
      • โญ๏ธ ES5
      • โญ๏ธ ES6 (2015)
      • โญ๏ธ ES2017
      • โญ๏ธ ES2016
      • โญ๏ธ ES2018
      • โญ๏ธ ES2020
    • ๐Ÿ”ฐconcept
      • ๐Ÿ”ฐexecution context
        • ๐Ÿ“˜this
          • โ—"this" determined on call siteโ—๏ธ
        • ๐Ÿ”ฐrunning execution context
        • ๐Ÿ”ฐlexical environment
          • ๐Ÿ”ฐenvironment record
          • ๐Ÿ”ธ[[Environment]]
          • โ—lexical environment optimizaton
        • ๐Ÿ”ฐcall stack
      • ๐Ÿ”ฐcontext
        • ๐Ÿ”ฐglobal context
        • ๐Ÿ”ฐclass body context
      • ๐Ÿ”ฐenvironment
        • โš™๏ธJS engine
          • ๐Ÿ”ฐmode
            • ๐Ÿ›ก๏ธstrict mode
              • ๐Ÿ›ก๏ธeval has its own scope in strict mode
              • โœ…always use strict mode
            • โ—sloppy mode
              • โ—accidental global variable in sloppy modeโ—๏ธ
              • โ—modify current scope at runtimeโ—๏ธ
            • โš–๏ธstrict vs. sloppy
          • ๐Ÿ”ฐv8
        • ๐Ÿ”ฐNode.js
      • ๐Ÿ”ฐassociated array
      • ๐Ÿ”ฐparser
    • ๐Ÿ”ฐcompilation
      • ๐Ÿ”ฐlexing
      • ๐Ÿ”ฐparsing
      • ๐Ÿ”ฐcode generation
      • ๐Ÿ”ฐJS is compiled
      • ๐Ÿ”ฐcompile-time
      • ๐Ÿ”ฐruntime
    • ๐Ÿ”ฐgrammar
      • ๐Ÿšฉdirective
        • ๐Ÿ“œ'use strict'
      • *๏ธtoken
        • ๐Ÿ—๏ธkeyword
          • ๐Ÿ”reserved word
            • โ—reserved word as property name is allowedโ—๏ธ
          • ๐Ÿ”‘contextual keyword
        • ๐Ÿ”ฃpunctuator
          • *๏ธhash (#)
          • ๐Ÿ”ฃsemicolon (;)
            • ๐Ÿ”ฐautomatic semicolon insertion
            • ๐Ÿ”ฐstatements that must end with ";"
          • ๐Ÿ”ฃdot (.)
          • ๐Ÿ”ฃcomma (,)
          • ๐Ÿ”ฃcolon (:)
          • ๐Ÿ”ฃplus (+)
          • ๐Ÿ”ฃequal (=)
          • ๐Ÿ”ฃ3 dots (...)
          • ๐Ÿ”ฃbrackets []
          • ๐Ÿ”ฃbraces {}
          • ๐Ÿ”ฃparentheses ()
          • ๐Ÿ”ฃquestion dot (?.)
          • ๐Ÿ”ฃquestion (?)
        • ๐Ÿ†”identifier
          • ๐Ÿ†”special identifier
          • โš–๏ธidentifier vs. string
          • โš–๏ธidentifier vs. keyword
          • โ—undeclared identifier
          • ๐Ÿ”ฐstatic binding
          • ๐Ÿ”ฐdynamic binding
        • โœก๏ธliteral
          • ๐Ÿ”ฐtrailing comma
      • ๐Ÿ”ฐcomment
      • ๐Ÿˆฏdeclaration
        • โ—redeclaration
        • ๐Ÿˆฏlexical declaration
      • ๐Ÿ“œstatement
        • ๐Ÿ“ฆexpression
          • ๐Ÿ“ฆprimary expression
          • ๐Ÿ“ฆinvocation expression๏ผšf()
            • ๐Ÿ“ฆmethod invocation
          • ๐Ÿ“ฆleft-hand side expression
        • ๐Ÿ”loop
          • ๐Ÿ”while
          • ๐Ÿ”do...while
          • ๐Ÿ”for loops
            • ๐Ÿ”for
              • ๐Ÿ”ฐ"for-init" scope
              • ๐Ÿ”ฐ"for-init" block
            • ๐Ÿ”for-in
            • ๐Ÿ”for-of
              • โ—arrays are iterated "live"โ—๏ธ
              • ๐Ÿ”ฐfor-of with objects
              • ๐Ÿ”ฐfor-of with strings
              • โš–๏ธfor-of vs. forEach
            • ๐Ÿ”for-await
            • โš–๏ธfor-in vs. for-of vs. in
            • ๐Ÿ“˜arr.forEach()
        • ๐Ÿ”€control flow
          • โคด๏ธjump
            • โคด๏ธreturn
            • โคด๏ธcontinue
            • โคด๏ธbreak
            • โš–๏ธcontinue vs. break
          • ๐Ÿ”€branch
            • ๐Ÿ”€if
            • ๐Ÿ”€switch
              • ๐Ÿ”€case clause
        • ๐Ÿ“œother statement
          • ๐Ÿ“œblock
            • ๐Ÿ”ฐblock scope
          • ๐Ÿ“œlabel
          • ๐Ÿ›‘with
          • ๐Ÿ“œempty statement
        • โ›”statement expectedโ—๏ธ
      • ๐Ÿšงoperator
        • ๐Ÿšงtable of operators
        • ๐Ÿ“–terms for operator
          • ๐Ÿ”ฐarity
          • ๐Ÿ”ฐassociativity
          • ๐Ÿ”ฐlvalue
          • ๐Ÿ”ฐdividend
          • ๐Ÿ”ฐdivisor
          • ๐Ÿ”ฐnon-numeric operand
          • ๐Ÿ”ฐshort-circuiting
        • ๐Ÿ”ดassignment
          • โญdestructuring assignment
            • ๐Ÿ”ฐdestructuring array
            • ๐Ÿ”ฐdestructuring iterable
            • ๐Ÿ”ฐobject destructuring
            • ๐Ÿ”ฐnested destructuring
              • ๐ŸŒŸnested default values
            • ๐Ÿ”ฐdestructuring arguments
          • โž•assignment (=)
        • ๐Ÿ”ดarithmetic operator
          • โญ•unary arithmetic operator
            • ๐Ÿšงunary plus (+)
          • โญ•binary arithmetic operator
            • โž•add/concate (+)
            • โž•division (/)
            • โž•remainder (%)
              • ๐Ÿ’พmodulo(a, b)
              • ๐Ÿ’พmod(a, b)
              • โš–๏ธremainder vs. modulo vs. mod
            • โž•exponentiation (**)
          • โญ•bitwise operator
            • ๐ŸŒŸ2's complement
            • ๐Ÿ’พbitview()
            • โž•bitwise not (~)
              • ๐Ÿ”ฐdouble tilde (~~)
              • โš–๏ธ(~~) vs. Math.trunc()
        • ๐Ÿ”ดrelational operator
          • ๐Ÿ”ฐequality & inequality operator
            • โž•sloppy equality (==)
            • โž•strict equality (===)
          • ๐Ÿ”ฐcomparison operator
          • โž•in
          • โž•instanceof
        • ๐Ÿšงlogical operator
          • โž•nullish coalescing (??)
          • โญ•unary logical operator
          • โญ•binary logical operator
        • โญ•unary operator
          • โž•void
        • โญ•binary operator
          • โž•comma operator (,)
        • โญ•ternary operator
          • โž•conditional operator (?:)
        • ๐Ÿ”ฐspread operator (...)
        • โž•rest operator (...)
      • ๐Ÿ”ฐstatement vs. declaration
    • ๐Ÿ”ฐscope
      • ๐Ÿ”ฐlexical scope
      • ๐Ÿ”ฐstatic scope
      • ๐Ÿ”ฐdynamic scope
      • โš–๏ธstatic vs. dynamic scoping
      • ๐Ÿ”ฐscope chain
      • โš–๏ธlexical environment vs. scope
      • ๐Ÿ”ฐtop-level scope
      • ๐ŸŒŸglobal scope
        • ๐Ÿ“˜global object
          • ๐Ÿท๏ธglobalThis
          • ๐Ÿ„window
            • ๐Ÿ”ธwindow.name
            • ๐Ÿ”ธwindow.navigator
          • ๐Ÿ„global
          • ๐Ÿ”ธeval
          • ๐Ÿ”ธglobal object property
        • ๐Ÿ’พisCurrentlyInGlobalScope()
        • ๐Ÿ”ฐglobal variable
          • ๐Ÿ”ฐglobal let
            • โ—global let shadows global object property
          • ๐Ÿ”ฐglobal var
        • ๐Ÿ”ธDOM element with "id"
      • ๐Ÿ”ฐmodule scope
      • ๐Ÿ”ฐfunction scope
      • ๐Ÿ”ฐfunction name scope
      • ๐Ÿ”ฐparameter scope
      • ๐Ÿ”ฐhoisting
        • ๐Ÿ”ฐfunction hoisting
          • โ—function hoisting firstโ—๏ธ
        • ๐Ÿ”ฐvariable hoisting
          • ๐Ÿ”ฐvar hoisting
            • โ—function expression not hoisted
          • ๐Ÿ”ฐlet/const/class hoisting
      • โš–๏ธcontext vs. scope
    • ๐Ÿ’value
      • ๐Ÿ”ฐtype
        • ๐Ÿ’falsy
        • ๐Ÿ“–terms for type
          • ๐Ÿ”ฐstatically typed
          • ๐Ÿ”ฐdynamically typed
        • ๐Ÿ”ฐtype conversion
        • ๐Ÿ”ฐtype name
          • โž•typeof
          • ๐Ÿ’พbaseTypeName()
          • ๐Ÿ’พtypeName()
          • ๐Ÿ’พcustom type name
        • ๐Ÿ”ฐnested type
        • ๐Ÿ‘”type functions
          • ๐Ÿ’พfunctionDefinition()
          • ๐Ÿ’พisObject()
          • ๐Ÿ’พisPrimitive()
          • ๐Ÿ’พisFunction()
          • ๐Ÿ’พisClass()
      • ๐Ÿฆ primitive
        • ๐Ÿ’nullish
        • ๐Ÿ”ธundefined
        • ๐Ÿ”null
        • ๐Ÿ”ขNumber
          • ๐Ÿ”ฐfloating-point
          • ๐Ÿ”ฐintegers
          • ๐Ÿ”ดspecial number
            • ๐Ÿ”ขInfinity
            • ๐Ÿ”ขNaN
            • ๐Ÿ”ขNumber.EPSILON
            • ๐Ÿ”ขNumber.MAX_VALUE
            • ๐Ÿ”ขNumber.MAX_SAFE_INTEGER
          • ๐Ÿ‘”Number+ext
            • ๐Ÿ’พn.toHex()
            • ๐Ÿ’พn.isEqual()
            • ๐Ÿ’พisNumber()
          • ๐Ÿ‘”Random
            • randomInt()
            • randomFloat()
          • ๐Ÿ‘”Quaternion
        • ๐Ÿ”ขBigInt
        • ๐Ÿฆ Boolean
        • ๐Ÿ”คString
          • ๐Ÿ”ฐraw string
          • ๐Ÿ”ฐescape sequence
          • template literal
            • tagged template
            • tag function
          • ๐Ÿ”ฐString methods
            • str.map()
            • ๐Ÿ’พstr.capitalize()
            • str.countLetters()
            • ๐Ÿ’พstr.htmlToElement()
            • str.kebabToCamelCase()
            • ๐Ÿ“˜str.match()
              • โœจsplit into course names
            • ๐Ÿ“˜str.matchAll()
              • โœจmatchAll() using named groups
              • โœจwords in sentence
            • str.random()
            • str.removeWhitespaces()
            • ๐Ÿ“˜str.replace()
              • ๐Ÿ”ฐreplacer function
              • โœจminus one
            • ๐Ÿ’พstr.replaceWhitespaces()
            • str.reverse()
            • str.shuffle()
            • ๐Ÿ’พstr.slice2()
            • ๐Ÿ’พstr.splice()
            • str.escapeHTML()
            • str.toDatasetPropName()
            • ๐Ÿ’พstr.words()
            • str.wordCounts()
            • String.fromCharCodes()
          • ๐Ÿ‘”String extension
            • ๐Ÿ’พstr.isKeyword
            • ๐Ÿ’พstr.isReservedWord
            • ๐Ÿ’พstr.isPunctuator
          • ๐Ÿ”ฐUnicode
            • ๐Ÿ”ฐcode point
            • ๐Ÿ”ฐgrapheme cluster
            • ๐Ÿ”ฐcode plane
            • ๐Ÿ”ฐcharacter encoding
              • ๐Ÿ”ฐUTF-16
                • ๐Ÿ”ฐcode unit
                • ๐Ÿ”ฐsurrogate pair
                • ๐Ÿ”ฐscalar
        • ๐Ÿ”บSymbol
          • ๐Ÿ”บSymbol.iterator
        • ๐Ÿ”ฐprimitive wrapper
      • ๐Ÿ„object
        • ๐Ÿ”ธproperty
          • ๐Ÿšฉattribute
            • ๐Ÿ„property descriptor
            • ๐Ÿ’พownPropertyFlags(obj)
          • ๐Ÿ”ธgetter/setter
          • ๐Ÿ”ธproperty name
            • โญcomputed property name
          • โญshorthand property
          • ๐Ÿ”ธinternal property
          • ๐Ÿ”ฐproperty access
            • ๐Ÿ“ฆproperty access expression
            • โž•dot notation (.)
              • โš–๏ธdot notation vs. decimal point
            • โž•bracket notation []
            • โž•optional chaining (?., ?.[])
              • โ“is Optional Chaining Supported?
              • ๐Ÿ’พobj.prop(path)
            • โž•optional invocation ?.()
              • is Optional Chaining Supported?
              • obj.prop(path)
            • ๐ŸŒŸchaining rules
              • โœจjane.boyfriend?.money.more
          • ๐Ÿ”ฐproperty creation/deletion
            • ๐Ÿ“˜Object.defineProperty()
            • โž•delete
              • โ—unqualified identifier for delete
          • ๐Ÿ”ฐproperty testing
          • ๐Ÿ”ฐproperty enumeration
        • ๐Ÿ”ฐcreating objects
          • โœก๏ธobject literal
            • โ—object literal is not a blockโ—๏ธ
          • โž•new
            • ๐Ÿ”ธnew.target
            • โš–๏ธcallable vs. constructable
          • โ“‚๏ธObject.create()
            • โœจ"pure" object
            • โœจguard against accidental modifications
        • ๐Ÿ”ฐextending objects
          • ๐Ÿ“˜Object.assign()
            • โ›”๏ธ Object.assign causing TypeError
            • โ—๏ธObject.assign copies with getter/setter
          • inheritance
            • ๐Ÿ”ธ__proto__
            • class A vs. class A extends Object
          • mixin
            • ๐Ÿ’พmergeWithoutOverride()
            • ๐Ÿ’พ.assignDescriptors()
            • mixin inheritance
            • โœจmixin: HandleEvents
          • ๐Ÿ’พ add default properties
          • extending built-in classes
        • ๐Ÿ”ฐconverting objects
          • ๐Ÿ”ฐserializing objects
          • ๐ŸŒŸobject -> primitive conversion
            • ๐Ÿ”˜prefer-string
            • ๐Ÿ”˜prefer-number
            • ๐Ÿ”˜no preference
          • โ“‚๏ธ.toString()
          • โ“‚๏ธ.valueOf()
          • ๐Ÿ’พvalueToString()
        • โ“‚๏ธmethod
          • ๐Ÿ’ [[HomeObject]]
          • ๐Ÿ”ฐpolymorphism
        • ๐Ÿ”ธprototype
          • ๐Ÿ”ฐprototype chain
            • ๐ŸšงprintPrototypeChain()
      • ๐Ÿ„function
        • ๐Ÿ”ฐcreating functions
        • ๐Ÿˆฏfunction declaration
          • โ—function in block (FiB)
          • โ—function redeclaration
          • ๐Ÿ“˜function declaration instantiation
        • ๐Ÿ”ฐfunction expression
          • โ—read-only identifier
          • ๐Ÿ”ฐnamed function expression
          • ๐Ÿ”ฐas variable
          • ๐Ÿ”ฐIIFE
        • ๐Ÿ”ฐarrow function
          • โ—arrow function as methodโ—๏ธ
          • ๐Ÿ”ฐarrow function as argument
          • โ—arrow function as class fieldโ—๏ธ
          • โ—arrow function returning object literal needs (...)โ—๏ธ
          • ๐Ÿ”ฐarrow function expression
        • ๐Ÿ”ฐclosure
          • โ—scopes matter with closures
          • ๐Ÿ’กprivate property by closure
          • โœจclosure examples
            • โœจclosure: to close over or not
            • โœจclosure: manage grades
            • โœจclosure as object
        • ๐ŸŒฟsorts of function
          • ๐Ÿ”ฐcallback
          • ๐Ÿ”ฐhigher-order function
            • ๐Ÿ’พnot(f)
            • ๐Ÿ’พpipe(f, g, ...)
            • ๐Ÿ’พpartial(f, a, b ...)
            • ๐Ÿงšdecorator
              • ๐Ÿ’พsaveCallHistory(f)
              • ๐Ÿ’พdelay(f, s)
              • ๐Ÿ’พbenchmark(f)
              • ๐Ÿ’พdebounce(f, s)
              • ๐Ÿ’พthrottle(f, s)
              • โš–๏ธdebounce vs. throttle
              • ๐Ÿงšmemoization
                • ๐Ÿงšmemoize by decorator
                  • ๐Ÿ’พmemoize(f)
                • ๐Ÿงšmemoize by closure
          • ๐Ÿ”ฐpredicate
          • ๐Ÿ”ฐnested function
          • ๐Ÿ”ฐrecursive function
            • โœจfindSolution()
            • ๐Ÿ’พdeepEqual()
        • ๐Ÿ”ฐfunction boundary
        • ๐Ÿ”ฐfunction overloading
        • ๐Ÿ”ฐfunction forwarding
        • ๐Ÿ”ธreturn value
        • ๐Ÿ”ธfunction name
          • ๐Ÿ”ฐanonymous function
        • โš–๏ธparameter vs. argument
        • ๐Ÿ”ธargument
          • โ—arguments are passed by valueโ—๏ธ
        • ๐Ÿ”ธparameter
          • ๐Ÿ”ธdefault parameter
          • ๐Ÿ”ธrest parameters
            • ๐Ÿ”ธrest parameters as object
          • ๐Ÿ”ธdestructured parameter
          • โš–๏ธsimple vs. non-simple parameter
          • โ—deplicate parameters
        • ๐Ÿ”ธprototype
        • ๐Ÿ”นconstructor
      • ๐Ÿ„class
        • ๐Ÿ”ฐinitialization
          • ๐Ÿ”นstatic block
        • ๐Ÿ”ธmember
          • ๐Ÿ”ธclass field
          • ๐Ÿ”ธprivate member
          • ๐Ÿ”ธstatic member
            • ๐Ÿ”ฐinit static property
          • private/protected members
          • ๐Ÿ”ธgetter/setter
          • ๐Ÿ”ธmethod
          • ๐Ÿ”ธbound method
        • ๐Ÿ”ฐcreating class
          • ๐Ÿ”ฐdelegation
        • ๐Ÿ”ฐinheritance
          • ๐Ÿ“˜super
          • derived class init
          • override constructor
          • override methods
          • override class fields
        • โœจexamples
          • โœจComplex
          • โœจTypedMap
          • โœจBag
      • ๐Ÿ“˜built-in objects
        • ๐Ÿ“˜Object
          • ๐Ÿ”ธObject.prototype
          • ๐Ÿ’พObject extension
            • ๐Ÿ’พobj.mergeWith()
        • ๐Ÿ“˜Function
        • ๐Ÿ“˜Array
          • ๐Ÿ”ธelement
            • ๐Ÿ”ธelement index
              • โ—element index is stringโ—๏ธ
          • ๐Ÿ”ธarray length
          • ๐Ÿ”ธarray object property
          • ๐Ÿ„sparse array
            • ๐Ÿ”ฐhow array methods deal with "holes" ?
          • ๐Ÿ”ฐarray-like
            • ๐Ÿ‘”Object+arrayLike
          • ๐Ÿ”ฐcreating arrays
            • โœก๏ธarray literal
              • ๐Ÿ”ฐundefined element
          • ๐Ÿ”ฐaccessing elements
          • ๐Ÿ”ฐiterating elements
          • ๐Ÿ“˜array methods
            • ๐Ÿ“˜arr.entries
            • ๐Ÿ“˜arr.filter()
            • ๐Ÿ“˜arr.flatMap()
            • ๐Ÿ“˜arr.reduce()
              • early break reduce()
            • ๐Ÿ“˜arr.slice()
            • ๐Ÿ“˜arr.splice()
          • ๐Ÿ‘”Array extension
            • ๐Ÿ’พarr.containsSubarray()
            • ๐Ÿ’พarr.copy()
            • ๐Ÿ’พarr.isEmpty
            • ๐Ÿ’พarr.last
            • ๐Ÿ’พarr.none()
            • ๐Ÿ’พarr.reversed()
            • ๐Ÿ’พarr.shuffle()
            • ๐Ÿ’พarr.randomElement
            • ๐Ÿ’พarr.removeDuplicates()
            • ๐Ÿ’พarr.uniqueMerge()
            • ๐Ÿ’พarr.removeUndefined()
            • ๐Ÿ’พarr.removeValue()
            • ๐Ÿ’พarr.sum(), .average()
            • ๐Ÿ’พarr.topN()
            • ๐Ÿ’พarr.rank()
            • ๐Ÿ’พarr.padEndSpaces()
            • ๐Ÿ’พarr.max()
            • ๐Ÿ’พarr.isMatrix
            • ๐Ÿ’พarr.indexDictionaryForValues()
            • Array extensions (archive)
          • โœจarray examples
            • ๐Ÿ’พobjects to HTML table
          • array & matrix methods
          • static methods
            • ๐Ÿ“Array(n) vs. Array(n).fill()
            • Array.from()
            • ๐ŸšงArray.list(n)
          • matrix methods
            • mat.matrixMap()
            • mat.transpose()
            • mat.maxElementInEachColumn()
          • Matrix methods
            • ๐ŸŒ€ Array.matrixFill()
        • ๐Ÿ“˜Set
          • ๐Ÿ‘”Set extension
            • ๐Ÿ’พset.isEqualTo()
        • ๐Ÿ“˜Map
          • Don't use object properties
        • ๐Ÿ“˜RegExp
          • ๐Ÿšฉregex flag
            • ๐Ÿšฉflag /u
            • ๐Ÿšฉflag /d
          • ๐Ÿ”ธlastIndex
          • ๐Ÿ”ฐcreating regex
          • ๐Ÿ”ฐusing regex
          • ๐Ÿ”ฐpattern
            • ๐Ÿ”ฐspecial characters
            • ๐Ÿ”ฐanchor
            • ๐Ÿ”ฐrepeat
              • ๐Ÿ”ฐgreedy vs. lazy
            • ๐Ÿ”ฐcharacter set
            • ๐Ÿ”ฐalternation (or)
            • ๐Ÿ”ฐgroup
              • ๐Ÿ”ฐcapturing group
                • ๐Ÿ”ฐnamed group
            • ๐Ÿ”ฐlookaround
            • ๐Ÿ”ฐinline modifier
            • ๐Ÿ”ฐreplace pattern
            • ๐Ÿ˜€emoji
          • โœจregex examples
            • โœจparse .ini file
            • โœจquick brown fox
            • โœจJS-style numbers
        • ๐Ÿ“˜Proxy
          • ๐Ÿ”นhandler method
          • ๐Ÿ“˜Reflect
          • โœจProxy examples
            • โœจidentity (proxy)
            • โœจread-only proxy
            • โœจobserve()
        • ๐Ÿ“˜Date
    • ๐Ÿ”ฐvariable
      • ๐Ÿˆฏvariable declaration
        • ๐Ÿ“œvar
          • โœ…stop using varโ—๏ธ
          • โ—var is a statementโ—๏ธ
          • โ—var has no block scopeโ—๏ธ
          • โ—accessing var before declaration gets undefinedโ—๏ธ
          • โ—global var / function is global object propertyโ—๏ธ
          • โ—var redeclaration applied even in strict modeโ—๏ธ
          • โ—var in block can't shadow outer letโ—๏ธ
          • โ—var can shadow parameter even in strict modeโ—๏ธ
        • ๐Ÿˆฏconst
          • โ›”const requires initialization
          • โ›”const can't reassign
          • โ›”no const for classic "for"
        • ๐Ÿˆฏlet
          • โœ…let redeclaration not allowed even in sloppy modeโ—๏ธ
          • โœ…let can't shadow parameter even in sloppy modeโ—๏ธ
        • ๐Ÿ”ฐinitial value
      • โ—variable redeclaration
        • โ—var redeclaration
        • โ—let redeclaration
      • ๐Ÿ”ดaccessing variables
        • โ›”temporal dead zone
          • โ›”TDZ
          • โ›”typeof let/const/class in TDZ gets an errorโ—๏ธ
        • โ›”uninitialized variable
        • ๐Ÿ”ฐLHS reference
        • ๐Ÿ”ฐRHS reference
        • โš–๏ธLHS vs. RHS reference
      • โ—variable shadowing
      • โ—can't delete variable/functionโ—๏ธ
    • ๐Ÿ”ฐmodule
      • โญES module
        • ๐Ÿˆฏimport
          • โœจimport ES module
          • dynamic import()
        • ๐Ÿˆฏexport
          • ๐Ÿ“˜default export
          • ๐Ÿ“˜named export
      • ๐Ÿ”ฐCommonJS
        • ๐Ÿ“œpackage.json
      • โš–๏ธES vs CommonJS
      • ๐Ÿ”ฐimport.meta
      • ๐Ÿ”ฐpackage
      • ๐Ÿ”ฐbundler
      • ๐Ÿ”ฐminifier
      • ๐Ÿ”ฐbrowser-specific features
      • ๐Ÿ”ฐmodule pattern
    • ๐Ÿ”ฐiteration
      • ๐Ÿ‘”Iterable+ext
        • ๐Ÿ’พrange()
        • ๐Ÿ’พobj.isIterable
      • ๐Ÿ”ฐiterable
        • ๐Ÿ”ธmake-iterator method
        • โ—only-iterate-once iterable
        • ๐Ÿ”ฐmake iterables
        • โœจiterable examples
          • โœจClosedRange
          • โœจSequence
      • ๐Ÿ”ฐiterator
        • ๐Ÿ”ธnext()
        • ๐Ÿ”ธreturn()
        • โ—iterators only iterate onceโ—๏ธ
        • ๐Ÿ”ฐiterable iterator
        • ๐Ÿ”ฐinfinite iterator
        • ๐Ÿ”ฐmake iterator iterable
        • ๐Ÿ’พIteratorPrototype
        • ๐Ÿ’พIterator
      • ๐Ÿ”ฐiteration result
      • ๐Ÿ“˜Generator
        • ๐Ÿ”ฐgenerator function
          • ๐Ÿ“˜function*
          • ๐Ÿ“ฆyield
          • ๐Ÿ“˜yield*
          • ๐Ÿ”ฐcomposition
          • ๐Ÿ”ฐgenerator function as ...
        • โœจgenerator examples
          • ๐Ÿ’พ*list()
          • ๐Ÿ’พ*integers()
          • ๐Ÿ’พ*closedRange()
          • ๐Ÿ’พ*fibonacci()
          • ๐Ÿ’พ*zip()
          • ๐Ÿ’พ*sequence()
          • ๐Ÿ’พ*interleave()
    • ๐Ÿ”ฐasync code
      • ๐Ÿ”ฐthread
      • ๐Ÿ”ฐevent loop
      • ๐Ÿ„Promise
        • ๐Ÿ‘”custom promises
          • ๐Ÿ’พgetJSON()
          • ๐Ÿ’พPromise.wait()
          • ๐Ÿ’พfutureValue()
        • ๐Ÿ”ฐusing Promises
        • ๐Ÿ”ฐerror handling
          • โญfinally()
          • ๐Ÿ”ฐrecoverable errors
        • ๐Ÿ”ฐchaining Promises
          • ๐Ÿ’พPromise.inSeries()
        • ๐Ÿ”ฐPromises in parallel
      • ๐Ÿ†”async
        • ๐Ÿ”ฐasync function
        • ๐Ÿ”ฐasync method
        • ๐Ÿ”ฐasync arrow function
        • ๐Ÿ”ฐasync IIFE
        • ๐Ÿ’พmeasureTime()
      • โž•await
        • ๐Ÿ”ฐawait promises
          • ๐Ÿ”ฐawait sequentially
          • ๐Ÿ”ฐawait in parallel
        • ๐Ÿ”ฐawait "thenable"
        • ๐Ÿ”ฐerror handling
    • ๐Ÿ”ฐdebugging
      • ๐Ÿ”ฐtesting
      • ๐Ÿ’Šerror handling
        • โคด๏ธthrow
        • ๐Ÿ”ฐrethrow
        • โคด๏ธtry-catch-finally
      • ๐Ÿ› ๏ธdevtools
        • ๐Ÿ“œdebugger
        • ๐Ÿ”ฐshow built-in shadow DOM
    • โ›”Error
      • ๐Ÿ”ดcompile-time error
        • โ›”๏ธ early errors
      • ๐Ÿ”ดruntime error
      • โ›”๏ธ SyntaxError
        • โ›”duplicate parameter not allowed in strict modeโ—๏ธ
        • โ›”unexpected token "xxx"โ—๏ธ
        • โ›”Named export 'xxx' not foundโ—๏ธ
        • โ›”unexpected numberโ—๏ธ
        • โ›”... parenthesis must be used to disambiguate operator precedenceโ—๏ธ
        • โ›”identifier 'xxx' has already been declaredโ—๏ธ
        • โ›”missing initializer in const declarationโ—๏ธ
        • โ›”lexical declaration cannot appear in a single-statement contextโ—๏ธ
        • โ›”delete of an unqualified identifier in strict modeโ—๏ธ
        • โ›”octal literals not allowed in strict modeโ—๏ธ
      • โ›”๏ธ ReferenceError
        • โ›”cannot access 'xxx' before initializationโ—๏ธ
        • โ›”'xxx' is not definedโ—๏ธ
      • โ›”๏ธ TypeError
        • โ›”'xxx' is not a functionโ—๏ธ
        • โ›”assignment to constant variableโ—๏ธ
        • โ›”cannot read properties of nullishโ—๏ธ
        • โ›”cannot convert BigInt to Numberโ—๏ธ
        • โ›”cannot convert Symbol to Numberโ—๏ธ
        • โ›”cannot assign to read only property 'prototype' of function 'xxx'โ—๏ธ
    • ๐Ÿ›๏ธLibraries
      • ๐Ÿ›๏ธJSXGraph
      • ๐Ÿ›๏ธgrapheme-splitter
    • ๐Ÿ› ๏ธtools
      • transpilers
    • โœจexamples
      • Code Wars
        • Next Bigger Number
        • Changing Money
        • Game of Life
      • Exercises
        • flattenObject()
        • Pascal's Triangle
        • Permuations
        • Spiral Matrix
    • ๐Ÿ’ผprojects
      • ๐Ÿ’ผDictionary App
      • ๐Ÿ’ผLanguage: Egg
      • Calculator โค๏ธ
      • Synth Keyboard โค๏ธ
      • Form Validation
      • Password Generator
  • ๐Ÿ”ฐweb component
    • ๐Ÿ”ธcustom element
      • lifecycle methods
      • getter/setter for attributes
      • Element Types
      • Element Info
      • Observed Attributes
      • Element Upgrades
      • Unknown Elements vs Undefined Custom Elements
      • Element-defined Content
    • ๐Ÿ”ธshadow DOM
      • light, shadow, flattened DOM
      • shadow root vs. host
      • shadow DOM styles
        • Use CSS Variables
        • CSS reset in Shadow DOM
      • shadow DOM events
        • retargeting
        • Active Element
        • Events that Cross Shadow DOM Boundary
        • Bubbling in Shadow DOM
      • shadow DOM slots
    • ๐Ÿ”ธ<template>
      • ๐Ÿ”ธ<slot>
        • ๐Ÿ”ธnamed slot
        • ๐Ÿ”ธfallback content
        • ๐Ÿ”ฐslotted node styles
        • ๐Ÿ”ธslotted nodes
        • ๐Ÿ”น`slotchange` event
        • ๐Ÿ”ฐSlot API
    • ๐Ÿ”ธlight DOM
    • ๐Ÿ”ฐimplementing components
    • ๐Ÿ”ฐusing components
      • ๐Ÿ’กhide components until defined
    • Built-in Components
      • <details>
    • โœจweb component examples
      • โœจ<search-box>
      • <my-log> โค๏ธ
      • <element-details>
      • <custom-dialog>
      • <user-card>
      • <expanding-list>
      • <dom-hierarchy> โญ๏ธ
      • <time-formatted>
      • <live-timer>
      • <error-message>
      • <popup-info>
      • <custom-menu>
  • ๐ŸŒbrowser
    • ๐Ÿ“˜web API
      • ๐Ÿ“˜clearTimeout()
      • ๐Ÿ“˜setTimeout()
      • ๐Ÿ„URL
      • ๐Ÿ„navigator
      • ๐Ÿ”ฐweb worker
        • ๐Ÿ„self
    • ๐Ÿ”ฐconcepts
      • ๐Ÿ”ฐcoordinates
    • ๐Ÿ”ฐEvent
      • ๐Ÿ”ธevent.type
      • ๐Ÿ”ธevent.currentTarget
      • ๐Ÿ”ธevent.target
        • โœจbuttons A, B, C
      • ๐Ÿ”ฐevent dispatching
      • ๐Ÿ”ฐevent propagation
        • ๐Ÿ”ฐbubbling phase
        • ๐Ÿ”ฐcapturing phase
        • ๐Ÿ”ฐstop propagation
          • โœจbutton in clickable paragraph
      • ๐Ÿ”ฐevent handler
        • invocation context
        • โŒreturn value
        • ๐Ÿ”ฐ"this" in event handler
        • ๐Ÿ”ฐregister handler
          • ๐Ÿ”ฐhandler options
          • capturing handler
          • ๐Ÿ„object handler
        • ๐Ÿ”ฐremove handler
        • โ—window-reflecting body element event handlers
      • ๐Ÿ”ฐdefault action
        • โœจhide or not to hide?
        • โœจlink going nowhere
      • ๐ŸŒฟevent types
        • ๐Ÿ”ฐkey event
          • โœจpress shift + space
        • ๐Ÿ”ฐinput event
        • ๐Ÿ”ฐmouse event
          • ๐Ÿ”ธ.buttons
          • ๐Ÿ”ธ.button
          • ๐Ÿ”ฐ"click"
            • โœจdraw dots
            • โœจsliding menu
            • โœจclosing button [x]
            • โœจclick to slide (carousel)
            • โœจclick to move ball
          • ๐Ÿ”ฐ"dblclick"
          • ๐Ÿ”ฐ"mousemove"
            • โœจdrag the bar
          • ๐Ÿ”ฐdrag event
          • ๐Ÿ‘”MouseEvent+ext
          • โœจmouse event examples
            • โœจmouse event coords
        • ๐Ÿ”ฐtouch event
          • ๐Ÿ”ธ.touches
          • ๐Ÿ”ธ.targetTouches
          • ๐Ÿ‘”TouchList+ext
        • ๐Ÿ”ฐscroll event
          • โœจscroll me
          • โœจscroll progress
          • โœจscroll progress on body
        • state-change
        • CSS events
      • client-side JavaScript timeline
      • custom events
        • event.isTrusted
      • "change" event
    • ๐Ÿ”ฐDOM
      • ๐Ÿ”ฐDOM hierarchy
      • ๐Ÿ”ฐquerying elements
        • ๐Ÿ’พ$(), $all()
      • ๐Ÿ”ฐtraversing DOM
      • ๐Ÿ”ฐcreate/insert/delete nodes
        • โœจtable of contents
      • ๐ŸŒฟDOM types
        • ๐Ÿ“˜Node
          • ๐Ÿ”ฐ.tagName vs .nodeName
          • ๐Ÿ‘”Node+ext
            • ๐Ÿ’พnode.isInPage
            • ๐Ÿšงnode.traverse()
            • ๐Ÿ’พnode.$(), .$all()
            • ๐Ÿšงnode.appendTag()
            • ๐Ÿ’พnewElement()
        • ๐Ÿ“˜Element
          • ๐Ÿ”ธelement content
          • ๐Ÿ”น.insertAdjacentHTML()
          • ๐Ÿ”ธattribute
            • ๐Ÿ”ธid
            • ๐Ÿ”ฐdata attributes
            • โš–๏ธattributes vs. properties
          • ๐Ÿ”ฐbox models
          • ๐Ÿ‘”Element+boxes
            • ๐Ÿ”ธ.scrollBox
              • ๐Ÿ”ฐscrollbar width
            • ๐Ÿ”ธ.paddingBox
            • ๐Ÿ”ธ.borderBox
              • ๐Ÿ”ธ.offsetParent
            • ๐Ÿ”ธ.boundingBox
              • โœจelem.showNote()
          • ๐Ÿ‘”Element+ext
            • ๐Ÿ’พelem.isInside()
            • ๐Ÿ’พelem.isHeading
            • ๐Ÿ’พelem.wrappedWith()
            • ๐Ÿ’พelem.wrappedWithHTML()
            • ๐Ÿšงelem.attr()
            • ๐Ÿšงelem.styleProp()
            • ๐Ÿšงelem.showDataAttr()
            • ๐Ÿ’พelem.position()
        • ๐Ÿ„HTMLElement
          • ๐Ÿ’พhtmlElem.isHidden
        • ๐Ÿ“˜Document
          • ๐Ÿ”ธdocument size
          • ๐Ÿ”ธmethods
            • ๐Ÿ“˜doc.elementFromPoint()
        • ๐Ÿ“˜Window
          • ๐Ÿ”น.requestAnimationFrame()
          • ๐Ÿ”ฐviewport
          • ๐Ÿ”ฐwindow scrolling
            • ๐Ÿ”ฐscroll smoothly
            • ๐Ÿ”ฐscroll lock
        • ๐Ÿ„DocumentFragment
        • ๐Ÿ„NodeList
          • NodeList vs. Array
        • CSSStyleDeclaration
      • โœจDOM examples
      • ๐Ÿ‘”custom methods
        • ๐Ÿšงprop()
        • ๐Ÿšงtag()
    • ๐Ÿ”ฐSVG
      • ๐Ÿ’พSVGElement()
      • Attributes
        • fill
        • stroke-dasharray
        • transform
      • ๐Ÿ”ฐgradients
        • ๐Ÿ“˜<linearGradient>
        • ๐Ÿ“˜<radialGradient>
      • Patterns
      • ๐Ÿ”ฐSVG shapes
        • <rect>
        • <line>
        • <polygon>
        • <polyline>
        • <ellipse>
        • <path>
      • โœจSVG examples
        • SVG as background image
        • 3 circles
        • โœจSVG Clock
        • โœจpie chart
      • namespace
      • tools
    • ๐Ÿ”ณ<canvas>
      • ๐Ÿ‘”Canvas+ext
        • ๐Ÿ’พdrawOnCanvas2D()
        • ๐Ÿ’พctx.point()
        • ๐Ÿ’พctx.polyline()
        • ๐Ÿ’พctx.roundedRect()
      • ๐Ÿ”ฐrectangle
      • ๐Ÿ”ฐpath
        • ๐Ÿ”ฐnonzero winding rule
        • ๐Ÿ“˜arcTo()
        • โœจcurves
      • ๐Ÿ”ฐtext
      • ๐Ÿ”ฐimage
        • โœจcanvas snapshot
      • ๐Ÿ”ฐgraphics state
        • ๐Ÿ”ฐfill / stroke styles
          • ๐Ÿ”ฐcolors
            • โœจcolor wheel
          • ๐Ÿ”ฐpatterns
          • ๐Ÿ”ฐgradients
            • ๐Ÿ’พctx.gradient()
        • ๐Ÿ”ฐshadows
        • ๐Ÿ”ฐcompositing
        • ๐Ÿ”ฐtransformation
          • โœจKoch snowflake
        • ๐Ÿ”ฐclipping
      • โœจcanvas examples
        • โœจsquare & circle
        • โœจopen/closed subpaths
        • โœจfractal
        • โœจregular polygons
    • ๐Ÿ”ฐstorage
    • ๐Ÿ”ฐanimation
      • โœจanimation examples
        • โœจmoving cat
        • โœจcat in hat
        • โœจcat behind hat
  • ๐Ÿ”ฐReact
    • ๅ•Ÿๅ‹•
    • Hello Reactโ—๏ธ
    • React Projects
      • FullStackOpen
        • Part 1
  • Server
    • HTTP status code
  • ๐Ÿ”–้™„้Œ„
    • ๐Ÿ‘”custom
      • ๐Ÿ‘”element
        • ๐Ÿ‘”tabs control
        • ๐Ÿ‘”left tabs
      • ๐Ÿ‘”custom css
        • ๐Ÿ‘”Every Layout
      • ๐Ÿ‘”custom classes
        • ๐Ÿ‘”Vector
        • ๐Ÿ‘”Rect
        • ๐Ÿ‘”Size
        • ๐Ÿ’พTableMaker
        • List
        • Point
        • Turtle
        • Matrix
      • ๐Ÿ‘”custom functions
        • randomElement()
        • randomColor()
        • randomPassword()
        • clone(obj)
        • functionName()
      • helper functions
    • ๐Ÿงฉthree.js
      • ๐Ÿ‘”Director
      • ๐Ÿ”ฐrenderer
        • ๐Ÿ”นset canvas size
      • โœจexamples
        • โœจstartup
      • ๐Ÿ”ฐprimitives
      • ๐Ÿ”ฐscene graph
    • ๐Ÿ…ฐ๏ธGoogle Apps Script
      • ๐Ÿ„app
        • ๐Ÿ”นhelpers
        • ๐Ÿ”ธapp.init()
        • ๐Ÿ”ธmembers
          • ๐Ÿ”ธapp.color
          • ๐Ÿ’พapp.dataRangeValuesFromSheet()
          • ๐Ÿ’พapp.sheetByName()
          • ๐Ÿ’พapp.valueOfNamedRange()
          • ๐Ÿ’พapp.deleteSheetByName()
          • ๐Ÿšงapp.cellValueAt()
          • โญapp.makeTable()
          • ๐Ÿšงapp.mergedCellValue()
          • ๐Ÿšงapp.parseFields()
          • ๐Ÿšงapp.fetch()
          • ๐Ÿšงapp.resizeColumns()
          • ๐Ÿšงapp.setBorder()
          • ๐Ÿšงapp.writeAwardList()
        • ๐Ÿ”ณprototypes
          • ๐Ÿ”ณapp.sheet.prototype
            • ๐Ÿ’พ sheet.delete()
            • ๐Ÿ’พ sheet.rangeByRect()
            • ๐Ÿ’พ sheet.setValues()
            • ๐Ÿ’พsheet.appendConditionalFormatRule()
            • ๐ŸšงSheetMethods
              • sheet.values()
          • ๐Ÿ”ณapp.range.prototype
            • range.alignCenter()
            • range.cellValue()
            • range.contains()
            • ๐Ÿšงrange.isEqualTo()
        • ๐ŸŸฅapp menu
      • ๐Ÿ„RawData
      • ๐ŸŒฟClasses
        • ๐Ÿ„Sheet
        • ๐Ÿ„Range
          • ๐Ÿ”ฐA1 notation
            • ๐Ÿ’พcolumnName()
            • ๐Ÿ’พA1Notation()
            • ๐Ÿ’พA1NotationToRowColumn()
          • ๐Ÿ”ฐborder
          • ๐Ÿ“˜range.setNumberFormat()
          • range.setRichTextValue()
        • ๐Ÿ„ConditionalFormatRule
        • ๐Ÿ„RichTextValueBuilder
        • ๐Ÿ„Protection
        • ๐Ÿ„Ui
      • ๐Ÿ‘”custom objects
        • ๐Ÿ‘”RangeRect
          • ๐Ÿ’พrect.cell(i, j)
          • ๐Ÿ’พRangeRect.byData()
        • ๐ŸšงBorderStyle
        • ๐ŸšงSheetFields, SheetField
      • ๐Ÿ’ผprojects
        • ๐Ÿ’ผไธ่ƒฝ่ฃœ่€ƒๅๅ–ฎ
        • ๐Ÿ’ผๅ„็ญๅนณๅ‡ๅŠๅ‰ไธ‰ๅ
        • ๐Ÿ’ผๅœ‹ไธญๆˆ็ธพไธ€่ฆฝ่กจ
        • ๐Ÿ’ผ้ซ˜ไธญ็Žๅญธ้‡‘ๅๅ†Š
      • ๐Ÿ’กtips
        • ๐Ÿ’ก custom prototypes
        • ๐Ÿ’ก refresh cells
        • ๐Ÿ’ก ๆขไปถๆ ผๅผ๏ผš่‡ช่จ‚ๅ…ฌๅผ
        • ่™•็†ๅญ—ไธฒ
        • ้กฏ็คบไธญๆ–‡ๆ˜ŸๆœŸๅนพ
        • ๅœจๅ„ฒๅญ˜ๆ ผไฝฟ็”จ้™ฃๅˆ—
        • Count non-blank cells
        • ๐Ÿ’ก ๅฟซ้€Ÿ่ชฟๆ•ดๆฌ„ไฝๅฏฌๅบฆ
      • โ“questions
      • ๐Ÿ“ŠGoogle Sheet
      • ๐Ÿ”ธGAS โŸฉ commands
      • โœจGAS โŸฉ examples
        • examples
        • โœจsplit data into tabs
          • migrate sheets into files
        • โœจevent: onEdit
      • ๐Ÿ”ฐGAS โŸฉ Events
        • onEdit
      • Dialogs & Sidebars
    • ๐Ÿ“–JSDoc
      • return value
      • destructured parameter
    • ๐Ÿ“ฆdata structure
      • ๐Ÿ“ฆQueue
      • ๐Ÿ“ฆStack
      • ๐Ÿ“ฆWaitingList
      • ๐Ÿ“ฆGraph
        • ๐Ÿ”น.findPath()
        • ๐Ÿ”น.findShortestPath()
        • ๐Ÿค–breadth-first search
        • ๐Ÿค–depth-first search
        • โœจGraph examples
          • โœจMail Robot
    • ๐Ÿ”ฐalgorithm
      • ๐Ÿ”ฐrecursion
        • โœจrecursion count
      • ๐Ÿ”ฐdynamic programming
      • Sort
        • sort strings
        • sort by multiple keys
        • bubble sort
      • โœจproblems
        • โœจfind couple
        • โœจknapsack problem
        • โœจlongest path
    • ๐Ÿ”ฐparadigm
      • ๐Ÿ”ฐTest Driven Development (TDD)
      • ๐Ÿ”ฐFunctional Programming (FP)
    • ๐Ÿ”ฐTypeScript
      • Setup
      • โญ๏ธ Cheat sheet
      • Type
        • type annotation
        • type predicate
        • Primitives
        • Narrowing
        • Tuples
        • Generics
          • Array<T>
          • Generic Functions
        • Object
          • Object Types
          • Object Properties
        • Function
          • optional/default parameters
          • return type
          • function type expression
          • callable objects with properties
          • function overloads
        • Union
          • discriminated union
      • TS Operators
    • ๐Ÿ’Žresource
      • โœ๏ธeditor
        • โœ๏ธVSCode
          • emmet
          • shortcuts
        • โœ๏ธreplit.com
          • ๐Ÿ”ฐimport .js file
      • ๐Ÿ”งtools
        • Vectornator
          • Tutorials
      • ๐Ÿ“šbooks
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๐ŸŒ
๐Ÿšธ
JS spec
MDN
strict mode
tips
Error
statement
expression
declaration
loop
token
literal
keyword
reserved word
contextual keyword
punctuator
identifier
operator
property
internal property
value
primitive
object
Number
String
Symbol
๐Ÿ”ฐ
๐Ÿ”ด
๐ŸŒŸ
โญ
๐Ÿ“˜
๐Ÿ’พ
๐Ÿˆฏ
โœ…
โ—
๐Ÿ›ก๏ธ
๐Ÿ’ก
โš–๏ธ
๐Ÿ‘‰
๐Ÿฉน
โ›”
๐Ÿ”˜
๐Ÿ›‘
๐Ÿ“œ
๐Ÿ“ฆ
๐Ÿ’
๐Ÿˆฏ
๐Ÿ”
*๏ธ
โœก๏ธ
๐Ÿ”ข
๐Ÿ—๏ธ
๐Ÿ”
๐Ÿ—๏ธ
๐Ÿ”‘
๐Ÿ”ฃ
#๏ธโƒฃ
๐Ÿ†”
๐Ÿท๏ธ
โž•
๐Ÿ”ธ
๐Ÿ’ 
๐Ÿ’
๐Ÿฆ 
๐Ÿ“ฆ
๐Ÿ„
๐Ÿ”ข
๐Ÿ”ค