javascript - How to add prefix to array values?

Question

I have an array of values to which I want to add some prefix:

var arr = ["1.jpg", "2.jpg", "some.jpg"];

Adding the prefix images/ should result in this:

newArr = ["images/1.jpg", "images/2.jpg", "images/some.jpg"];

Answer 1

Array.prototype.map is a great tool for this kind of things:

arr.map(function(el) { 
  return 'images/' + el; 
})

In ES2015+:

arr.map(el => 'images/' + el)