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Merge branch 'fix_reduce_initial_value' of http://github.com/mcmire/underscore

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Jeremy Ashkenas
2010-11-01 08:30:53 -04:00
parent c595974771 c21e7b24c6
commit 974ae99e87
2 changed files with 11 additions and 2 deletions
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3
test/collections.js
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@@ -65,6 +65,9 @@ $(document).ready(function() {
sum = _([1, 2, 3]).reduce(function(sum, num){ return sum + num; }, 0); sum = _([1, 2, 3]).reduce(function(sum, num){ return sum + num; }, 0);
equals(sum, 6, 'OO-style reduce'); equals(sum, 6, 'OO-style reduce');
var sum = _.reduce([1, 2, 3], function(sum, num){ return sum + num; });
equals(sum, 6, 'default initial value');
}); });
test('collections: reduceRight', function() { test('collections: reduceRight', function() {

10
underscore.js
View File

@@ -94,10 +94,16 @@
_.reduce = _.foldl = _.inject = function(obj, iterator, memo, context) { _.reduce = _.foldl = _.inject = function(obj, iterator, memo, context) {
if (nativeReduce && obj.reduce === nativeReduce) { if (nativeReduce && obj.reduce === nativeReduce) {
if (context) iterator = _.bind(iterator, context); if (context) iterator = _.bind(iterator, context);
return obj.reduce(iterator, memo); var args = [iterator];
if (memo !== undefined) args.push(memo);
return obj.reduce.apply(obj, args);
} }
each(obj, function(value, index, list) { each(obj, function(value, index, list) {
memo = iterator.call(context, memo, value, index, list); if (memo === undefined && index == 0) {
memo = value;
} else {
memo = iterator.call(context, memo, value, index, list);
}
}); });
return memo; return memo;
}; };