console.assert() vs invariant

Benchmark created by Pete on January 8, 2015

Setup

/**
     * Copyright 2013-2014, Facebook, Inc.
     * All rights reserved.
     *
     * This source code is licensed under the BSD-style license found in the
     * LICENSE file in the root directory of this source tree. An additional grant
     * of patent rights can be found in the PATENTS file in the same directory.
     *
     * @providesModule invariant
     */
    
    "use strict";
    
    var __DEV__ = true;
    
    /**
     * Use invariant() to assert state which your program assumes to be true.
     *
     * Provide sprintf-style format (only %s is supported) and arguments
     * to provide information about what broke and what you were
     * expecting.
     *
     * The invariant message will be stripped in production, but the invariant
     * will remain to ensure logic does not differ in production.
     */
    
    var invariant = function(condition, format, a, b, c, d, e, f) {
      if (__DEV__) {
        if (format === undefined) {
          throw new Error('invariant requires an error message argument');
        }
      }
    
      if (!condition) {
        var error;
        if (format === undefined) {
          error = new Error(
            'Minified exception occurred; use the non-minified dev environment ' +
            'for the full error message and additional helpful warnings.'
          );
        } else {
          var args = [a, b, c, d, e, f];
          var argIndex = 0;
          error = new Error(
            'Invariant Violation: ' +
            format.replace(/%s/g, function() { return args[argIndex++]; })
          );
        }
    
        error.framesToPop = 1; // we don't care about invariant's own frame
        throw error;
      }
    };

Test runner

try {
  invariant(false, 'Something bad happened'); //: %s', 'oops');
} catch (e) {}

try {
  console.assert(false, 'Something bad happened:'); //, 'oops');
} catch (e) {}

Revisions

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

• Revision 1: published by Pete on January 8, 2015