What is right way to use CALL and APPLY ()

Ajinkya, this main difference between call() and apply() is that call requires a list of arguments and apply accepts an array of arguments. So if you create a function like this:

function concat( a, b, c){
    console.log(a+" "+b+" "+c);
}

you would need to use call, because the function accepts a set number of value ( a, b, c). Now if the function was written like this:

function concat(array){
    var string;
    for (x in array){
        string += x+" ";
    }
    console.log(string);
}

where the function accepts an array as an argument then you would need to use apply.

The important thing to remember with call and apply is how are the arguments passed into the function. If they are a list ( separated by commas) then use call. If they are an array or object then use apply. For more information checkout call and apply

Hi, Andrew Shook Thanks for reply. Yes I eventual ended at MDN link. Also found this http://odetocode.com/blogs/scott/archive/2007/07/04/function-apply-and-function-call-in-javascript.aspx

Also I wanted to know more example where we can practically use them.