Any and All methods in arrays (lists and collections) are handy and expressive. This gist is an implementation of them for JavaScript. The tests explains their usage.

array.prototype.additions.js

(function (Array) {

  var isFunction = function (value) {
    var getType = {};
    return value && getType.toString.call(value) === '[object Function]';
  };
    
  var anyItemMeetsPredicate = function (items, predicate) {
    for (var i=0; i < items.length; i++) {
      if (predicate(items[i]) === true) {
        return true;
      }
    }
    return false;
  };

  /*
   * .any(value)
   *    - value is object
   *    Checks if any item in the array equals the value
   *
   * .any(predicate)
   *    - predicate is function (receiving a value, returning a boolean)
   *    The predicate is applied to all elements. If the application of predicate on any element returns true, the result
   *    is true, otherwise the result is false.
   */
  Array.prototype.any = function (value) {
    if (isFunction(value) === true) {
      return anyItemMeetsPredicate(this, value);
    } else {
      return this.indexOf(value) > -1;
    }
  };
  

  var makePredicateFrom = function (value) {
    if (isFunction(value) === true) {
      return value;
    } else {
      return function (item) { return item == value; };
    }
  };

  var allItemsMeetsPredicate = function(items, predicate) {
    for (var i=0; i < items.length; i++) {
      if (predicate(items[i]) === false) {
        return false;
      }
    }

    return true;
  };

  /*
   * .all(value)
   *    - value is object
   *    Checks if all items in the array equals the value
   *
   * .all(predicate)
   *    - predicate is function (receiving a value, returning a boolean)
   *    The predicate is applied to all elements. If the application of predicate on all elements returns true, the result
   *    is true, otherwise the result is false.
   */
  Array.prototype.all = function (value) {
    var predicate = makePredicateFrom(value);
    return allItemsMeetsPredicate(this, predicate);
  };
    
})(Array);

array.prototype.additions.test.js

(function () {

  var log = function (message) { 
    $('.log').append(message + "\n"); // DID YOU GET JQUERY?
  };

  var assert = function (result, message) { 
    log(message + " : " + (result ? "pass" : "ERROR")); 
  };
  
  var even = function (n) {
    return n % 2 == 0;
  };
  
  
  assert([1, 9, 8, 0, 5].any(0), "[1, 9, 8, 0, 5] has a 0");
  assert([3, 0, 5, 7, 4].any(1) == false, "[3, 0, 5, 7, 4] has no 1");
  
  assert([1, 2, 3, 4, 5].any(even), "[1, 2, 3, 4, 5] has an even number");
  assert([1, 3, 5, 7, 9].any(even) == false, "[1, 3, 5, 7, 9] has no even number");
  
  assert([0, 0, 0, 0, 0].all(0), "in [0, 0, 0, 0, 0] all items are 0");
  assert([0, 0, 0, 0, 1].all(0) == false, "in [0, 0, 0, 0, 1] not all items are 0");
  
  assert([2, 4, 6, 8, 6].all(even), "in [2, 4, 6, 8, 6] all items are even");
  assert([2, 4, 6, 8, 7].all(even) == false, "in [2, 4, 6, 8, 7] not all items are even");
    
})();