JavaScript Array extensions

To continue along the line of the JavaScript Array extensions (see my last post on map and forEach introduced in ECMAScript 5), today I’m going to cover Array#some and Array#every. These are two functions for returning booleans based on Arrays, under certain conditions.

If you’re into Ruby, #every is the same as #all?, and #some is the same as #any?

Array#every will return true if every iteration of an array returns true (with shortcutting on the first false element):

var numbers = [1, 2, 3];
numbers.every(function (number) {
  return number > 2;
}); // false

Array#some will return true if any iteration of an array returns true (with shortcutting on the first true element):

var numbers = [1, 2, 3];
numbers.some(function (number) {
  return number > 2;
}); // true