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array_splice.html
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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>