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Merge branch 'master' of github.com:documentcloud/underscore

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This commit is contained in:
Jeremy Ashkenas
2011-02-01 20:22:47 -05:00
parent bdfd71021d 7aaf3616df
commit d0faeb53c1
2 changed files with 4 additions and 2 deletions
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2
test/arrays.js
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@@ -5,6 +5,7 @@ $(document).ready(function() {
test("arrays: first", function() {
equals(_.first([1,2,3]), 1, 'can pull out the first element of an array');
equals(_([1, 2, 3]).first(), 1, 'can perform OO-style "first()"');
equals(_.first([1,2,3], 0).join(', '), "", 'can pass an index to first');
equals(_.first([1,2,3], 2).join(', '), '1, 2', 'can pass an index to first');
var result = (function(){ return _.first(arguments); })(4, 3, 2, 1);
equals(result, 4, 'works on an arguments object.');
@@ -15,6 +16,7 @@ $(document).ready(function() {
test("arrays: rest", function() {
var numbers = [1, 2, 3, 4];
equals(_.rest(numbers).join(", "), "2, 3, 4", 'working rest()');
equals(_.rest(numbers, 0).join(", "), "1, 2, 3, 4", 'working rest(0)');
equals(_.rest(numbers, 2).join(', '), '3, 4', 'rest can take an index');
var result = (function(){ return _(arguments).tail(); })(1, 2, 3, 4);
equals(result.join(', '), '2, 3, 4', 'aliased as tail and works on arguments object');

4
underscore.js
View File

@@ -284,7 +284,7 @@
// values in the array. Aliased as `head`. The **guard** check allows it to work
// with `_.map`.
_.first = _.head = function(array, n, guard) {
return n && !guard ? slice.call(array, 0, n) : array[0];
return (n != null) && !guard ? slice.call(array, 0, n) : array[0];
};
// Returns everything but the first entry of the array. Aliased as `tail`.
@@ -292,7 +292,7 @@
// the rest of the values in the array from that index onward. The **guard**
// check allows it to work with `_.map`.
_.rest = _.tail = function(array, index, guard) {
return slice.call(array, _.isUndefined(index) || guard ? 1 : index);
return slice.call(array, (index == null) || guard ? 1 : index);
};
// Get the last element of an array.