code: function omit(array, exp) {
  
    if(!isArray(array) || isUndefined(exp)) {
      return array;
    }
  
    return array.filter(function(elm) {
      return (isObject(elm) || isFunction(exp))
        ? !$parse(exp)(elm)
        : elm !== exp;
    });
  }
docs: @name omit
  @kind function
  
  @description
  get an array, and return a new array without the omitted objects(by expression).