| /* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */ |
| /* This Source Code Form is subject to the terms of the Mozilla Public |
| * License, v. 2.0. If a copy of the MPL was not distributed with this |
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| |
| |
| /** |
| File Name: 15.5.4.4-3.js |
| ECMA Section: 15.5.4.4 String.prototype.charAt(pos) |
| Description: Returns a string containing the character at position |
| pos in the string. If there is no character at that |
| string, the result is the empty string. The result is |
| a string value, not a String object. |
| |
| When the charAt method is called with one argument, |
| pos, the following steps are taken: |
| 1. Call ToString, with this value as its argument |
| 2. Call ToInteger pos |
| 3. Compute the number of characters in Result(1) |
| 4. If Result(2) is less than 0 is or not less than |
| Result(3), return the empty string |
| 5. Return a string of length 1 containing one character |
| from result (1), the character at position Result(2). |
| |
| Note that the charAt function is intentionally generic; |
| it does not require that its this value be a String |
| object. Therefore it can be transferred to other kinds |
| of objects for use as a method. |
| |
| This tests assiging charAt to a user-defined function. |
| |
| Author: christine@netscape.com |
| Date: 2 october 1997 |
| */ |
| var SECTION = "15.5.4.4-3"; |
| var VERSION = "ECMA_1"; |
| startTest(); |
| var TITLE = "String.prototype.charAt"; |
| |
| writeHeaderToLog( SECTION + " "+ TITLE); |
| |
| var foo = new MyObject('hello'); |
| |
| |
| new TestCase( SECTION, "var foo = new MyObject('hello'); ", "h", foo.charAt(0) ); |
| new TestCase( SECTION, "var foo = new MyObject('hello'); ", "e", foo.charAt(1) ); |
| new TestCase( SECTION, "var foo = new MyObject('hello'); ", "l", foo.charAt(2) ); |
| new TestCase( SECTION, "var foo = new MyObject('hello'); ", "l", foo.charAt(3) ); |
| new TestCase( SECTION, "var foo = new MyObject('hello'); ", "o", foo.charAt(4) ); |
| new TestCase( SECTION, "var foo = new MyObject('hello'); ", "", foo.charAt(-1) ); |
| new TestCase( SECTION, "var foo = new MyObject('hello'); ", "", foo.charAt(5) ); |
| |
| var boo = new MyObject(true); |
| |
| new TestCase( SECTION, "var boo = new MyObject(true); ", "t", boo.charAt(0) ); |
| new TestCase( SECTION, "var boo = new MyObject(true); ", "r", boo.charAt(1) ); |
| new TestCase( SECTION, "var boo = new MyObject(true); ", "u", boo.charAt(2) ); |
| new TestCase( SECTION, "var boo = new MyObject(true); ", "e", boo.charAt(3) ); |
| |
| var noo = new MyObject( Math.PI ); |
| |
| new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "3", noo.charAt(0) ); |
| new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", ".", noo.charAt(1) ); |
| new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "1", noo.charAt(2) ); |
| new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "4", noo.charAt(3) ); |
| new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "1", noo.charAt(4) ); |
| new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "5", noo.charAt(5) ); |
| new TestCase( SECTION, "var noo = new MyObject(Math.PI); ", "9", noo.charAt(6) ); |
| |
| test(); |
| |
| function MyObject (v) { |
| this.value = v; |
| this.toString = new Function( "return this.value +'';" ); |
| this.valueOf = new Function( "return this.value" ); |
| this.charAt = String.prototype.charAt; |
| } |
| |