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Merge pull request #285 from malclocke/add_index_argument_to_last

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Add an optional index argument to _.last()
This commit is contained in:
Jeremy Ashkenas
2011-10-04 13:06:07 -07:00
parent 7d0e4169a9 e449b00a26
commit d79cd48bc5
2 changed files with 8 additions and 3 deletions
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4
test/arrays.js
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@@ -26,8 +26,12 @@ $(document).ready(function() {
test("arrays: last", function() { test("arrays: last", function() {
equals(_.last([1,2,3]), 3, 'can pull out the last element of an array'); equals(_.last([1,2,3]), 3, 'can pull out the last element of an array');
equals(_.last([1,2,3], 0).join(', '), "", 'can pass an index to last');
equals(_.last([1,2,3], 2).join(', '), '2, 3', 'can pass an index to last');
var result = (function(){ return _(arguments).last(); })(1, 2, 3, 4); var result = (function(){ return _(arguments).last(); })(1, 2, 3, 4);
equals(result, 4, 'works on an arguments object'); equals(result, 4, 'works on an arguments object');
result = _.map([[1,2,3],[1,2,3]], _.last);
equals(result.join(','), '3,3', 'works well with _.map');
}); });
test("arrays: compact", function() { test("arrays: compact", function() {

7
underscore.js
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@@ -306,9 +306,10 @@
return slice.call(array, (index == null) || guard ? 1 : index); return slice.call(array, (index == null) || guard ? 1 : index);
}; };
// Get the last element of an array. // Get the last element of an array. Passing **n** will return the last N
_.last = function(array) { // values in the array. The **guard** check allows it to work with `_.map`.
return array[array.length - 1]; _.last = function(array, n, guard) {
return (n != null) && !guard ? slice.call(array, array.length - n) : array[array.length - 1];
}; };
// Trim out all falsy values from an array. // Trim out all falsy values from an array.