Mirrors/lodash
1
0
Fork 0
mirror of https://github.com/whoisclebs/lodash.git synced 2026-02-02 08:07:50 +00:00
Code Issues Packages Projects Releases Wiki Activity

reverted _.buildLookup, restoring _.without to it's previous implementation, adding a test for object identity

Browse Source
This commit is contained in:
Jeremy Ashkenas
2010-02-24 12:53:35 -05:00
parent 412d2e4486
commit d7acbca2ce
4 changed files with 7 additions and 28 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
underscore.js
View File

@@ -252,24 +252,6 @@
return _.toArray(obj).length;
};
// Build a lookup map from a collection.
// Pay a little memory upfront to make searching a collection for a
// value faster later
// e.g:
//
// var lookup = _.buildLookup([1,2,8]) // {1: true, 2: true, 8: true}
// lookup[key] // instead of: _.include(array, key)
//
// See example usage in #without
// By default sets the value to true, can pass in a value to use instead
_.buildLookup = function (obj, useValue) {
useValue = (useValue === undefined)? true : useValue;
return _.reduce(obj, {}, function (memo, value) {
memo[value] = useValue;
return memo;
});
};
// -------------------------- Array Functions: ------------------------------
// Get the first element of an array. Passing "n" will return the first N
@@ -308,8 +290,8 @@
// Return a version of the array that does not contain the specified value(s).
_.without = function(array) {
var lookup = _.buildLookup(_.rest(arguments));
return _.filter(array, function(value){ return !lookup[value]; });
var values = _.rest(arguments);
return _.select(array, function(value){ return !_.include(values, value); });
};
// Produce a duplicate-free version of the array. If the array has already