Pointers in JavaScript?

Question

Can we pass a reference of a variable that is immutable as argument in a function?

Example:

var x = 0;
function a(x)
{
    x++;
}
a(x);
alert(x); //Here I want to have 1 instead of 0

Answer 1

Since JavaScript does not support passing parameters by reference, you'll need to make the variable an object instead:

var x = {Value: 0};

function a(obj)
{
    obj.Value++;
}

a(x);
document.write(x.Value); //Here i want to have 1 instead of 0