The Tor Browser / file revision

 // Copyright 2009 the Sputnik authors.  All rights reserved.

 // This code is governed by the BSD license found in the LICENSE file.

 /**

  * Operator ++x returns x = ToNumber(x) + 1

  *

  * @path ch11/11.4/11.4.4/S11.4.4_A3_T3.js

  * @description Type(x) is string primitive or String object

  */

 //CHECK#1

 var x = "1"; 

 ++x;

 if (x !== 1 + 1) {

   $ERROR('#1: var x = "1"; ++x; x === 1 + 1. Actual: ' + (x));

 }

 //CHECK#2

 var x = "x"; 

 ++x; 

 if (isNaN(x) !== true) {

   $ERROR('#2: var x = "x"; ++x; x === Not-a-Number. Actual: ' + (x));

 }

 //CHECK#3

 var x = new Number("-1"); 

 ++x;

 if (x !== -1 + 1) {

   $ERROR('#3: var x = new String("-1"); ++x; x === -1 + 1. Actual: ' + (x));

 }