Jasmine type matchers (native and underscore/lodash)

jasmine-type-matchers-lodash.js

/**
 * Add matchers for different types
 * Note that Function.prototype.bind is not supported in PhantomJS
 * Uses underscore/lodash
 *
 * Usage: expect('test').toBeString();
 */
!function() {
  'use strict';

  function typeOf(obj) {
    return ({}).toString.call(obj).match(/\s([a-z|A-Z]+)/)[1].toLowerCase();
  }

  function compare(expected, actual) {
    return {
      pass: typeOf(actual) === expected
    };
  }

  var toBeType = {};
  _.each([
    'String',
    'Function',
    'RegExp',
    'Math',
    'Number',
    'Date',
    'Error',
    'Array',
    'Boolean',
    'Object'
  ], function(name) {
    toBeType['toBe' + name] = function() {
      return {
        compare: _.bind(compare, this, name.toLowerCase())
      };
    };
  });

  beforeEach(function() {
    jasmine.addMatchers(toBeType);
  });
}();

jasmine-type-matchers.js

/**
 * Add matchers for different types
 * Note that Function.prototype.bind is not supported in PhantomJS
 *
 * Usage: expect('test').toBeString();
 */
!function() {
  'use strict';

  function typeOf(obj) {
    return ({}).toString.call(obj).match(/\s([a-z|A-Z]+)/)[1].toLowerCase();
  }

  function compare(expected, actual) {
    return {
      pass: typeOf(actual) === expected
    };
  }

  var toBeType = {};
  [
    'String',
    'Function',
    'RegExp',
    'Math',
    'Number',
    'Date',
    'Error',
    'Array',
    'Boolean',
    'Object'
  ].forEach(function(name) {
    toBeType['toBe' + name] = function() {
      return {
        compare: compare.bind(this, name.toLowerCase())
      };
    };
  });

  beforeEach(function() {
    jasmine.addMatchers(toBeType);
  });
}();