javascript - Functional approach to basic array construction

Question

This is my code, acting upon myArray:

var myArray = [];
var i;

for(i = 0; i < 20; i += 1) {
   myArray.push(Math.random());
}

Is there a functional equivalent of the above that does without the dummy variable i?

Favorite answers:

• while(myArray.push(Math.random()) < 20);
• $.map(Array(20), Math.random);
• for(var myArray = []; myArray.push(Math.random()) < 20;);

Answer 1

Not in ES5, there's no real functional equivalent to it, as you have to have something which has an amount of 20 to apply map to...

var my20ElementArray = [0,1,2,3,4,5,6,7,8,9,10];
var myArray = my20ElementArray.map(Math.random);

You could create an xrange-like function what is in Python but that would just hide this "unused" variable inside a function.