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Javascript-interview-questions-advanced-->View question

Explain function.prototype.bind in javascript.

what is function.prototype.bind?


Asked On2022-01-12 06:32:10 by:shwet0710

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The bind() method creates a new function that, when called, has its this keyword set to the provided value, with a given sequence of arguments preceding any provided when the new function is called.

Syntax

bind(thisArg)
bind(thisArg, arg1)
bind(thisArg, arg1, arg2)
bind(thisArg, arg1, ... , argN)

Parameters

thisArg

The value to be passed as the this parameter to the target function func when the bound function is called. The value is ignored if the bound function is constructed using the new operator. When using bind to create a function (supplied as a callback) inside a setTimeout, any primitive value passed as thisArg is converted to object. If no arguments are provided to bind , or if the thisArg is null or undefined, the this of the executing scope is treated as the thisArg for the new function.

arg1, arg2, ...argN Optional

Arguments to prepend to arguments provided to the bound function when invoking func.

Return value

A copy of the given function with the specified this value, and initial arguments (if provided).

Description

The bind() function creates a new bound function, which is an exotic function object (a term from ECMAScript 2015) that wraps the original function object. Calling the bound function generally results in the execution of its wrapped function.

A bound function has the following internal properties:

[[BoundTargetFunction]]

The wrapped function object

[[BoundThis]]

The value that is always passed as this value when calling the wrapped function.

[[BoundArguments]]

A list of values whose elements are used as the first arguments to any call to the wrapped function.

[[Call]]

Executes code associated with this object. Invoked via a function call expression. The arguments to the internal method are a this value and a list containing the arguments passed to the function by a call expression.

When a bound function is called, it calls internal method [[Call]] on [[BoundTargetFunction]], with following arguments Call(boundThis, ...args). Where boundThis is [[BoundThis]]args is [[BoundArguments]], followed by the arguments passed by the function call.

A bound function may also be constructed using the new operator. Doing so acts as though the target function had instead been constructed. The provided this value is ignored, while prepended arguments are provided to the emulated function.


Answerd on:2022-01-13 Answerd By:Raj-Gupta

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