bind in JS

·

1 min read

Function.prototype.bind()

The bind() method returns 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.

What's here for us to learn this bind method:

1) How it sets the this keyword for the returned function . 2) How it arranges the arguments while calling returned function. [Pre Configuring the function arguments]

  • How arguments are arranged by bind() method:

    Whatever arguments we provide in the bind(this,args) methods those will be precded by other additional arguments that we provide while calling the returned function.

Ex:

function Combine(Showresult,Optype,args)
{
let sum=args;
let res=0;
console.log(sum);
for(elememt of sum)
{
  if(Optype=="ADD")
res+=elememt;

if(Optype=="SUB")
res-=elememt;

}

Showresult(res);

}

function Showresult(MesgText,res)
{

 console.log(MesgText+res);

}

Combine(Showresult.bind(this,"this addtion is "),"ADD",[7,9,6,5,8,9]);

Combine(Showresult.bind(this,"this substraction is "),"SUB",[7,9,6,5,8,9]);