Dynamically call JavaScript function with multiple arguments [closed]

Question

How can I call this function dynamically? How can I pass arguments dynamically inside braces of this dynamic call?

function a(b,c,d){
}

var functionName = 'a';
window [functionName]();  

Answer 1

Well, it's much more simplier then you think

var f = function (a, b, c) {...};

var a = ...,
    b = ...,
    c = ...;
//to call a function do
f(a,b,c); 
//or
f.call(null, a, b, c);
//or
f.apply(null, [a,b,c]);