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This feature is well established and works across many devices and browser versions. Its been available across browsers since 2015 7.
* Some parts of this feature may have varying levels of support.
Function() Function . eval() ( ) . eval() Function .
Function.prototype Function .
Function.prototype.arguments Function.prototype.caller . , caller TypeError .
Function.prototype.constructor . Function Function .
Function .
displayName Optional.
length.
name.
prototype new . .
Function.prototype.apply()Function.prototype.bind() this , .
Function.prototype.call() this .
Function.prototype.toString()Function.prototype[@@hasInstance]() . instanceof .
Function , .
Function .
eval() .
// `var`
var x = 10;
function createFunction1() {
const x = 20;
return new Function("return x;"); // `x` `x`
}
function createFunction2() {
const x = 20;
function f() {
return x; // `x` `x`
}
return f;
}
const f1 = createFunction1();
console.log(f1()); // 10
const f2 = createFunction2();
console.log(f2()); // 20
f1() x Node.js ReferenceError . Node x .
| Specification |
|---|
| ECMAScript 2027 LanguageSpecification # sec-function-objects |
This page was last modified on 2026 7 15 by MDN contributors.
FunctionObject/FunctionObject.prototype.__defineGetter__()Object.prototype.__defineSetter__()Object.prototype.__lookupGetter__()Object.prototype.__lookupSetter__()Object.prototype.hasOwnProperty()Object.prototype.isPrototypeOf()Object.prototype.propertyIsEnumerable()Object.prototype.toLocaleString()Object.prototype.toString()Object.prototype.valueOf()Your blueprint for a better internet.
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