Underscore.js isType Alternatives (v9)

Revision 9 of this benchmark created on August 24, 2012

Preparation HTML

<script src="https://documentcloud.github.com/underscore/underscore.js"></script>

Setup

var $ = window.jQuery,
      _ = window._,
      array = [1, 2, 3],
      func  = function(){},
      string = "string",
      number = 101,
      date   = new Date,
      regexp = /regexp/i;
  
  function isFunction(obj) {
    return typeof obj === 'function';
  }
  
  function isString(obj) {
    return typeof obj === 'string';
  }
  
  function isNumber(obj) {
    return typeof obj === 'number';
  }

Test runner

_.isFunction(func);
_.isFunction(array);

_.isString(string);
_.isString(array);

_.isNumber(number);
_.isNumber(string);

isFunction(func);
isFunction(array);

isString(string);
isString(array);

isNumber(number);
isNumber(string);

typeof func == 'function';
typeof array == 'function';

typeof string == 'string';
typeof array == 'string';

typeof number == 'number';
typeof string == 'number';

typeof func === 'function';
typeof array === 'function';

typeof string === 'string';
typeof array === 'string';

typeof number === 'number';
typeof string === 'number';

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.

• Revision 1: published by Jeremy Ashkenas on October 17, 2011
• Revision 4: published by Paul Miller on October 20, 2011
• Revision 5: published by John-David Dalton on October 20, 2011
• Revision 7: published by Shane O'Sullivan on February 7, 2012
• Revision 9: published on August 24, 2012
• Revision 10: published on November 26, 2013
• Revision 11: published by Jesús Germade on December 17, 2014
• Revision 12: published by test on January 7, 2015
• Revision 13: published by Dan on January 8, 2015
• Revision 14: published by Jesús Germade on February 27, 2015
• Revision 15: published by Jesús Germade on February 28, 2015
• Revision 16: published by Jesús Germade on February 28, 2015
• Revision 17: published by mingc on October 14, 2015
• Revision 18: published by Eldar Abusalimov on February 16, 2016