Util function

function-util

(function(util) {

  var toString = Object.prototype.toString;
  var AP = Array.prototype;


  util.isString = function(val) {
    return toString.call(val) === '[object String]';
  };


  util.isObject = function(val) {
    return val === Object(val);
  };


  util.isFunction = function(val) {
    return toString.call(val) === '[object Function]';
  };


  util.isArray = Array.isArray || function(val) {
    return toString.call(val) === '[object Array]';
  };


  util.indexOf = AP.indexOf ?
      function(arr, item) {
        return arr.indexOf(item);
      } :
      function(arr, item) {
        for (var i = 0, len = arr.length; i < len; i++) {
          if (arr[i] === item) {
            return i;
          }
        }
        return -1;
      };


  var forEach = util.forEach = AP.forEach ?
      function(arr, fn) {
        arr.forEach(fn);
      } :
      function(arr, fn) {
        for (var i = 0, len = arr.length; i < len; i++) {
          fn(arr[i], i, arr);
        }
      };


  util.map = AP.map ?
      function(arr, fn) {
        return arr.map(fn);
      } :
      function(arr, fn) {
        var ret = [];
        forEach(arr, function(item, i, arr) {
          ret.push(fn(item, i, arr));
        });
        return ret;
      };


  util.filter = AP.filter ?
      function(arr, fn) {
        return arr.filter(fn);
      } :
      function(arr, fn) {
        var ret = [];
        forEach(arr, function(item, i, arr) {
          if (fn(item, i, arr)) {
            ret.push(item);
          }
        });
        return ret;
      };


  util.unique = function(arr) {
    var ret = [];
    var o = {};

    forEach(arr, function(item) {
      o[item] = 1;
    });

    if (Object.keys) {
      ret = Object.keys(o);
    }
    else {
      for (var p in o) {
        if (o.hasOwnProperty(p)) {
          ret.push(p);
        }
      }
    }

    return ret;
  };


  util.now = Date.now || function() {
    return new Date().getTime();
  };

})(birdNS._util);
//from SeaJS