Wrapping function within a function

JavaScript
1

Hello all
I wanted to know that what is the advantages of wrapping a function within another function. why should we make our code more complex when we can do it in an easier and shorter way(i.e. with only one function)?
Thanks in advance

3

For example:

function x(y) {
     "use strict";
     return function(c, d){
           return a + b;
     };
};
4

So the purpose of the example you provided is to allow us to call a function when we don’t have all of the variables or arguments yet, and then call the rest of the function later.

So for example:

function sumThree(a) {
   return function(b) {
          return function(c) {
                 return (a + b + c);
            }
    }
}

The above lets us call function “sumThree” with a minimum of one argument to max of three arguments. That’s useful for two cases. Either we know all three arguments and can call the function with all three immediately:

sumThree(1)(2)(3) //1 + 2 + 3

or we only happen to know one argument right now and can store the rest to call later.

let someVariable = sumThree(1) // returns a function that has 1 as its argument and needs two more arguments. which we can then call with:

someVariable(2)(3) // 1 + 2 + 3

I hope that makes sense!

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