Function.prototype

The Function.prototype property represents the Function prototype object.

Description

Function objects inherit from Function.prototype. Function.prototype cannot be modified.

Properties

Function.arguments

An array corresponding to the arguments passed to a function. This is deprecated as property of Function, use the arguments object available within the function instead.

Function.arity

Used to specifiy the number of arguments expected by the function, but has been removed. Use the length property instead.

Function.caller

Specifies the function that invoked the currently executing function.

Function.length

Specifies the number of arguments expected by the function.

Function.name

The name of the function.

Function.displayName

The display name of the function.

Function.prototype.constructor

Specifies the function that creates an object's prototype. See Object.prototype.constructor for more details.

Methods

Function.prototype.apply()

Calls a function and sets its this to the provided value, arguments can be passed as an Array object.

Function.prototype.bind()

Creates a new function which, when called, has its this set to the provided value, with a given sequence of arguments preceding any provided when the new function was called.

Function.prototype.call()

Calls (executes) a function and sets its this to the provided value, arguments can be passed as they are.

Function.prototype.isGenerator()

Returns true if the function is a generator; otherwise returns false.

Function.prototype.toSource()

Returns a string representing the source code of the function. Overrides the Object.prototype.toSource method.

Function.prototype.toString()

Returns a string representing the source code of the function. Overrides the Object.prototype.toString method.

Specifications

Specification	Status	Comment
ECMAScript 1st Edition (ECMA-262)	Standard	Initial definition. Implemented in JavaScript 1.1
ECMAScript 5.1 (ECMA-262) The definition of 'Function.prototype' in that specification.	Standard
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Function.prototype' in that specification.	Standard
ECMAScript 2017 Draft (ECMA-262) The definition of 'Function.prototype' in that specification.	Draft

Browser compatibility

See also

• Function