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add #buildLookup method to turn collection in to a fast lookup hash

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implement #without in terms of it
add tests and internal docs
This commit is contained in:
Mike Frawley
2010-02-17 10:12:22 -06:00
parent 1b1943b0ca
commit 263b1ee92d
3 changed files with 28 additions and 3 deletions
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7
test/collections.js
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@@ -164,5 +164,12 @@ $(document).ready(function() {
test('collections: size', function() {
equals(_.size({one : 1, two : 2, three : 3}), 3, 'can compute the size of an object');
});
test('collections: buildLookup', function() {
same(_.buildLookup([1,'hi']), {1:true, 'hi':true}, 'defaults values to true');
same(_.buildLookup([1,'hi'], 1), {1:1, 'hi':1}, 'can override value');
same(_.buildLookup({5:'five'}), {five: true}, 'making a map from an object uses its values');
});
});