JSTests/test262/test/language/expressions/prefix-decrement/S11.4.5_A3_T3.js

// Copyright 2009 the Sputnik authors.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
info: Operator --x returns x = ToNumber(x) - 1
es5id: 11.4.5_A3_T3
description: Type(x) is primitive string or String object
---*/

//CHECK#1
var x = "1"; 
--x;
if (x !== 1 - 1) {
  throw new Test262Error('#1: var x = "1"; --x; x === 1 - 1. Actual: ' + (x));
}

//CHECK#2
var x = "x"; 
--x; 
if (isNaN(x) !== true) {
  throw new Test262Error('#2: var x = "x"; --x; x === Not-a-Number. Actual: ' + (x));
}

//CHECK#3
var x = new Number("-1"); 
--x;
if (x !== -1 - 1) {
  throw new Test262Error('#3: var x = new String("-1"); --x; x === -1 - 1. Actual: ' + (x));
}