Source: assert.js

  1. /**
  2.  * @file Assert functions.
  3.  * @version March 26, 2017
  4.  *
  5.  * @author Olivier Pirson --- http://www.opimedia.be/
  6.  * @license GPLv3 --- Copyright (C) 2017 Olivier Pirson
  7.  */
  9. /**
  10.  * Returns true iff assertions are enabled
  11.  * iff window.ASSERT_ENABLED is defined.
  12.  *
  13.  * @returns {boolean}
  14.  */
  15. function isAssert() {
  16.     "use strict";
  18.     return (window.ASSERT_ENABLED !== undefined);
  19. }
  23. /**
  24.  * Assertion function.
  25.  *
  26.  * If its first parameter is true
  27.  * then does nothing,
  28.  * else prints to the console next parameters.
  29.  *
  30.  * If !isAssert()
  31.  * then always does nothing.
  32.  */
  33. let assert = function () {};
  35. if (isAssert()) {
  36.     console.log("Assertions enabled!");
  37.     assert = console.assert;  // https://developer.mozilla.org/en-US/docs/Web/API/Console/assert
  38. }