🔰function hoisting

identifier hoisted at top of scope, value initialized to a function value (instantly).

JS ⟩ scope ⟩ hoisting ⟩ function hoisting

identifier： hoisted to the top of its scope.
value： initialized to a function value (instantly).

referencing a function in block (FiB) outside block

sloppy mode: ✅ hoisted / initialized to undefined (outside block)
strict mode: ⛔ ReferenceError (invisible outside block)❗

related topics
- function declaration

replit：function hoisting

// function declarations can be called from the start
greeting();                        // Hello!

// ⭐️ function hoisting
// ------------------------------------------------------
// • applies to "function declarations" only.
// • identifier: (function name) hoisted to top of scope.
// • value     : initialized (to a function value).
// ------------------------------------------------------
function greeting() {
    console.log("Hello!");
}

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Last updated 3 years ago