Function

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This feature is well established and works across many devices and browser versions. Its been available across browsers since 2015 ..

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JavaScript- Function. , (function(){}).constructor === Function, true.

Function.prototype.apply(thisArg [, argsArray]): this thisArg. Array.
Function.prototype.bind(thisArg[, arg1[, arg2[, ...argN]]]): , this thisArg. , .
Function.prototype.call(thisArg[, arg1, arg2, ...argN]): this . .
Function.prototype.toString(): . Object.prototype.toString.

Function

, Function, , .. . , , , Function. Global_Objects/eval -.

var x = 10;

function createFunction1() {
  var x = 20;
  return new Function("return x;"); //  |x|    |x|
}

function createFunction2() {
  var x = 20;
  function f() {
    return x; //  |x|    |x| 
  }
  return f;
}

var f1 = createFunction1();
console.log(f1()); // 10
var f2 = createFunction2();
console.log(f2()); // 20

, Node.js f1() ReferenceError, x . - , Node , x .

Specification
ECMAScript 2027 LanguageSpecification # sec-function-objects

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Function

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