Question

Is there way of generating a string made up of 250 underscores, without using a loop?
I want to avoid writing code like this:

var myString= '';
for (var i=0; i < 250; i++) {
    myString += '_';
}

Answer 1

There’s no built-in solution but the question Repeat String – Javascript has a nice solution:

If you don’t want to alter the String prototype you can just do:

var num = 250;
var myChar = '_';
var myString = new Array(num + 1).join(myChar);

This is creating an array of 251 undefineds an then joining them by your character.
Since undefined is ” (empty string) when converted to a string in .join(), this gives you the string you’re after.