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Tweaks to Issue #53

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Jeremy Ashkenas
2010-11-01 08:40:41 -04:00
parent 974ae99e87
commit 51e327f8e5
1 changed files with 3 additions and 4 deletions
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7
underscore.js
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@@ -92,14 +92,13 @@
// **Reduce** builds up a single result from a list of values, aka `inject`, // **Reduce** builds up a single result from a list of values, aka `inject`,
// or `foldl`. Delegates to **ECMAScript 5**'s native `reduce` if available. // or `foldl`. Delegates to **ECMAScript 5**'s native `reduce` if available.
_.reduce = _.foldl = _.inject = function(obj, iterator, memo, context) { _.reduce = _.foldl = _.inject = function(obj, iterator, memo, context) {
var initial = memo !== void 0;
if (nativeReduce && obj.reduce === nativeReduce) { if (nativeReduce && obj.reduce === nativeReduce) {
if (context) iterator = _.bind(iterator, context); if (context) iterator = _.bind(iterator, context);
var args = [iterator]; return initial ? obj.reduce(iterator, memo) : obj.reduce(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) {
if (memo === undefined && index == 0) { if (!initial && index === 0) {
memo = value; memo = value;
} else { } else {
memo = iterator.call(context, memo, value, index, list); memo = iterator.call(context, memo, value, index, list);