Javascript - Function Function call()

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Introduction

The call() method first argument is the this value, but the remaining arguments are passed directly into the function.

Using call() arguments must be enumerated specifically: 

function sum(num1, num2){
    return num1 + num2;
}

function callSum(num1, num2){
    return sum.call(this, num1, num2);
}

console.log(callSum(10,10));   //20

Using the call() method, callSum() must pass in each of its arguments explicitly.