code: function (arr, pred) {
      for (var i = 0; i < arr.length; i++) {
        var value = arr[i];
        if (pred(value, i, arr)) {
          return value;
        }
      }
      return null;
    }
docs: Find array element satisfying the predicate.
  @param {Array} arr array
  @param {Function} pred predicate accepting current value, index, original array
  @return {*} found value or null
  @memberOf Util