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Implementation of Array.prototype.splice
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Array.splice Implementation</title> | |
| <link rel="stylesheet" type="text/css" href="http://github.com/jquery/qunit/raw/master/qunit/qunit.css" /> | |
| <script type="text/javascript" src="http://github.com/jquery/qunit/raw/master/qunit/qunit.js"></script> | |
| <script type="text/javascript"> | |
| if (!Array.prototype.splice2) { | |
| Array.prototype.splice2 = function(index, howmany) { | |
| if (index < 0) { | |
| index = this.length + index; | |
| }; | |
| if (!howmany || howmany < 0) { | |
| howmany = 0; | |
| }; | |
| var selection = this.slice(index, index + howmany); | |
| this.copyFrom( | |
| this.slice(0, index) | |
| .concat(Array.prototype.slice.apply(arguments, [2])) | |
| .concat(this.slice(index + howmany))); | |
| return selection; | |
| }; | |
| }; | |
| if (!Array.prototype.copyFrom) { | |
| Array.prototype.copyFrom = function(source) { | |
| for (var i = 0; i < source.length; i++) { | |
| this[i] = source[i]; | |
| }; | |
| this.length = source.length; | |
| return this; | |
| }; | |
| }; | |
| </script> | |
| <script type="text/javascript"> | |
| module("Testing Array.prototype.splice()"); | |
| function check(arrays, index, howmany) { | |
| var replacement = Array.prototype.slice.apply(arguments, [3]); | |
| var argumentsDescription = "[" + arrays.original + "], " + index + ", " + howmany; | |
| var args = replacement.slice(0); | |
| args.unshift(howmany, index); | |
| [{name: "splice()", func: Array.prototype.splice}, | |
| {name: "splice2()", func: Array.prototype.splice2}].forEach(function (spliceFunction) { | |
| var arrayToSplice = arrays.original.slice(0); | |
| deepEqual(spliceFunction.func.apply(arrayToSplice, args), arrays.spliceResult, | |
| spliceFunction.name + " splice result, " + argumentsDescription); | |
| deepEqual(arrayToSplice, arrays.splicedOriginal, | |
| spliceFunction.name + "changed original array " + argumentsDescription); | |
| }); | |
| }; | |
| test("There is only first 'index', 'howmany' is undefined", function() { | |
| check({original: [1, 2, 3], | |
| spliceResult: [], | |
| splicedOriginal: [1, 2, 3] | |
| }, 1); | |
| check({original: [1, 2, 3], | |
| spliceResult: [], | |
| splicedOriginal: [1, 2, 3] | |
| }, 0); | |
| check({original: [1, 2, 3], | |
| spliceResult: [], | |
| splicedOriginal: [1, 2, 3] | |
| }, -1); | |
| check({original: [1, 2, 3], | |
| spliceResult: [], | |
| splicedOriginal: [1, 2, 3] | |
| }, 10); | |
| }); | |
| test("Combinations of 'index' and 'howmany' parameters", function() { | |
| check({original: [1, 2, 3], | |
| spliceResult: [2], | |
| splicedOriginal: [1, 3] | |
| }, 1, 1); | |
| check({original: [1, 2, 3], | |
| spliceResult: [1], | |
| splicedOriginal: [2, 3] | |
| }, 0, 1); | |
| check({original: [1, 2, 3], | |
| spliceResult: [3], | |
| splicedOriginal: [1, 2] | |
| }, -1, 1); | |
| check({original: [1, 2, 3], | |
| spliceResult: [], | |
| splicedOriginal: [1, 2, 3] | |
| }, 10, 1); | |
| check({original: [1, 2, 3], | |
| spliceResult: [], | |
| splicedOriginal: [1, 2, 3] | |
| }, 1, 0); | |
| check({original: [1, 2, 3], | |
| spliceResult: [], | |
| splicedOriginal: [1, 2, 3] | |
| }, 0, 0); | |
| check({original: [1, 2, 3], | |
| spliceResult: [], | |
| splicedOriginal: [1, 2, 3] | |
| }, -1, 0); | |
| check({original: [1, 2, 3], | |
| spliceResult: [], | |
| splicedOriginal: [1, 2, 3] | |
| }, 10, 0); | |
| check({original: [1, 2, 3], | |
| spliceResult: [], | |
| splicedOriginal: [1, 2, 3] | |
| }, 1, -1); | |
| check({original: [1, 2, 3], | |
| spliceResult: [], | |
| splicedOriginal: [1, 2, 3] | |
| }, 0, -1); | |
| check({original: [1, 2, 3], | |
| spliceResult: [], | |
| splicedOriginal: [1, 2, 3] | |
| }, -1, -1); | |
| check({original: [1, 2, 3], | |
| spliceResult: [], | |
| splicedOriginal: [1, 2, 3] | |
| }, 10, -1); | |
| check({original: [1, 2, 3], | |
| spliceResult: [2, 3], | |
| splicedOriginal: [1] | |
| }, 1, 20); | |
| check({original: [1, 2, 3], | |
| spliceResult: [1, 2, 3], | |
| splicedOriginal: [] | |
| }, 0, 20); | |
| check({original: [1, 2, 3], | |
| spliceResult: [3], | |
| splicedOriginal: [1, 2] | |
| }, -1, 20); | |
| check({original: [1, 2, 3], | |
| spliceResult: [], | |
| splicedOriginal: [1, 2, 3] | |
| }, 10, 20); | |
| }); | |
| test("There are replacement elements", function() { | |
| check({original: [1, 2, 3], | |
| spliceResult: [2], | |
| splicedOriginal: [1, 4, 3] | |
| }, 1, 1, 4); | |
| check({original: [1, 2, 3], | |
| spliceResult: [2], | |
| splicedOriginal: [1, 4, 5, 6, 7, 8, 3] | |
| }, 1, 1, 4, 5, 6, 7, 8); | |
| }); | |
| </script> | |
| </head> | |
| <body> | |
| <h1 id="qunit-header">Array.splice Implementation</h1> | |
| <h2 id="qunit-banner"></h2> | |
| <div id="qunit-testrunner-toolbar"></div> | |
| <h2 id="qunit-userAgent"></h2> | |
| <ol id="qunit-tests"></ol> | |
| </body> | |
| </html> |
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