var toString = ({}).toString;
var hasOwnProp = ({}).hasOwnProperty;

var utils = {
  noop: function noop() {},

  isString: function isString(str) {
    return typeof str === 'string';
  },

  forEach: function forEach(obj, fn) {
    for (var key in obj) {
      if (hasOwnProp.call(obj, key)) {
        fn(key, obj[key]);
      }
    }
  },

  assign: function assign (dest, methods) {
    utils.forEach(methods, function (key, val) {
      dest[key] = val;
    });
  }
};

function checkType(type) {
  return function _checkType(val) {
    return toString.call(val) === '[object ' + type + ']';
  };
}

// add isRegExp, isArray, isFunction
['RegExp', 'Array', 'Function'].forEach(function addIsChecks(type) {
  utils['is' + type] = checkType(type);
});

module.exports = utils;