JS: Function Object

By Xah Lee. Date: . Last updated: .

Function is the value of the property key "Function" of the global object. [JS: the Global Object]

console.log( window["Function"] === Function ); // true


Function is a function.

[see JS: Value Types]

// type of Function
console.log ( typeof Function === "function" ); // true


Parent of Function is Function.prototype. [see JS: Prototype and Inheritance]

// parent of Function
console.log ( Object.getPrototypeOf ( Function ) === Function.prototype ); // true


Purpose of Function is:

  1. To define a function from strings. (Useful when you need to generate function definition at run time).
  2. Holds the property key "prototype". The value of Function.prototype is the parent object of all function objects.

Function Constructor

JS: Function Constructor



This is a data property. Its value is 1. This property has the attributes { writable: false, "enumerable": false, configurable: true }.

[see JS: Property Attributes, writable, enumerable, configurable]

ECMAScript 2015 §Fundamental Objects#sec-function.length


ECMAScript 2015 §Fundamental Objects#sec-function-objects

Function Topic

  1. Define Function
  2. Functional Programing
  3. Arrow Function
  4. Function Parameters
  5. f Declaration vs Expression
  6. Closure
  7. Function Call, Apply, Bind
  8. Function Argument Default Value
  9. Function Rest Parameters
  10. Function Argument Destructure
  11. Function Object
  12. Function.prototype
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