Using eval() in Javascript to unpack the array

Question

I have an array that I need to unpack.

So, from something like

var params = new Array();
params.push("var1");
params.push("var2");

I need to have something like

"var1", "var2".

I tried using eval, but eval() gives me something like var1, var2...i don't want to insert quotes myself as the vars passed can be integers, or other types. I need to pass this to a function, so that's why i can't just traverse the array and shove it into a string.

What is the preferred solution here?

Answer 1

If you have an array of values that you want to pass to a function filling the formal parameters then you can use the apply method of the Function prototype.

var arr = [1, 2, "three"];

function myFunc(a, b, c) {
   // a = 1, b = 2, c = "three"
   ...
}

myFunc.apply(this, arr);

By the way, the this parameter in the last statement can be set to any object to set the value of this inside myFunc

Answer 2

This generates the output you want

var params = new Array();
params.push("var1");
params.push("var2");

var s = "\"" + params.join("\",\"") + "\"";