🔰Unicode

🚧 under construction -> tidy this page

JS ⟩ value ⟩ primitive ⟩ String ⟩ Unicode

• every Unicode character is assigned a code point.

• code points are divided into 17 code planes.

• one or more code points can be combined into a single grapheme cluster.

• character encoding transforms code points into code units.

• most JavaScript engines use UTF-16 encoding.

🗺️

Unicode

🧨

🔴

👥 相關

🛠

📗

📘

🗣

• Script (a writing system) = Cyrillic, Greek, Arabic, Han (Chinese) ... 👉 full list)

JS

const {log} = console;
const convert = require('./Converter.js');                

[
    convert.stringToCodeUnits("🍎"),    // [ 55356=a, 57166=b ]

    /🍎{3}/.test("🍎🍎🍎"),              // false❗️
    // assume 🍎 = ab (2 code units)
    // 🍎{3} = ab{3} = abbb ≠ ababab = 🍎🍎🍎

    convert.stringToCodeUnits("🌹"),    // [ 55356=a, 57145=c ]

    /<.>/.test("<🌹>"),                 // false❗️
    // assumn 🌹 = ac (2 code units)
    // <.> != <ac>

    /<.>/u.test("<🌹>"),                // true ⭐️
    // ✅ enable /u flag
    

    // 搜尋「漢字」
    `Hello Привет 你好`.match(/\p{sc=Han}/gu),  // [ '你', '好' ]

    // Script
    /\p{Script=Greek}/u.test("α"),      // → true
    /\p{Script=Arabic}/u.test("α"),     // → false

    // Alphabetic
    /\p{Alphabetic}/u.test("α"),        // → true
    /\p{Alphabetic}/u.test("!"),        // → false
    /\p{Alphabetic}/u.test("漢"),       // → true

].forEach(x => log(x));

JS

properties

📗 參考

💾 程式

main categories and subcategories

• Letter L:

  • lowercase Ll

  • modifier Lm,

  • titlecase Lt,

  • uppercase Lu,

  • other Lo.

• Number N:

  • decimal digit Nd,

  • letter number Nl,

  • other No.

• Punctuation P:

  • connector Pc,

  • dash Pd,

  • initial quote Pi,

  • final quote Pf,

  • open Ps,

  • close Pe,

  • other Po.

• Mark M (accents etc):

  • spacing combining Mc,

  • enclosing Me,

  • non-spacing Mn.

• Symbol S:

  • currency Sc,

  • modifier Sk,

  • math Sm,

  • other So.

• Separator Z:

  • line Zl,

  • paragraph Zp,

  • space Zs.

• Other C:

  • control Cc,

  • format Cf,

  • not assigned Cn,

  • private use Co,

  • surrogate Cs.