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optimized keys, values, and pluck

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This commit is contained in:
Jeremy Ashkenas
2009-10-29 11:03:53 -04:00
parent 1d8420af00
commit 9b1da9b258
2 changed files with 6 additions and 14 deletions
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16
underscore.js
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@@ -149,11 +149,9 @@
});
};
// Optimized version of a common use case of map: fetching a property.
// Convenience version of a common use case of map: fetching a property.
_.pluck = function(obj, key) {
var results = [];
_.each(obj, function(value){ results.push(value[key]); });
return results;
return _.map(obj, function(value){ return value[key]; });
};
// Return the maximum item or (item-based computation).
@@ -357,18 +355,12 @@
// Retrieve the names of an object's properties.
_.keys = function(obj) {
return _.reduce(obj, [], function(memo, value, key) {
memo.push(key);
return memo;
});
return _.map(obj, function(value, key){ return key; });
};
// Retrieve the values of an object's properties.
_.values = function(obj) {
return _.reduce(obj, [], function(memo, value) {
memo.push(value);
return memo;
});
return _.map(obj, identity);
};
// Extend a given object with all of the properties in a source object.