code: function(_obj, _fromIdx) {
        var accept = typeof _obj !== 'function' ?
          function(e) { return e === _obj; } : _obj;
  
        return Utils.indexWhere(this, accept, _fromIdx);
      }
docs: @memberof CollectionApi#
  
  @description Finds the location of an object in the array.
  
  If a function is provided then the index of the first item for which the function returns true.
  
  @param {RecordApi|function} _obj Object to find
  @param {integer} _fromIdx Index from which to start searching, defaults to 0
  @return {number} Object index or -1 if not found