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Add guard check to _.last()

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Allows _.last() to work as expected with _.map().
This commit is contained in:
Malcolm Locke
2011-09-01 01:10:10 +12:00
parent a8f0445192
commit e449b00a26
2 changed files with 5 additions and 3 deletions
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2
test/arrays.js
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@@ -30,6 +30,8 @@ $(document).ready(function() {
equals(_.last([1,2,3], 2).join(', '), '2, 3', '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() {

6
underscore.js
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@@ -307,9 +307,9 @@
}; };
// Get the last element of an array. Passing **n** will return the last N // Get the last element of an array. Passing **n** will return the last N
// values in the array. // values in the array. The **guard** check allows it to work with `_.map`.
_.last = function(array, n) { _.last = function(array, n, guard) {
return (n != null) ? slice.call(array, array.length - n) : array[array.length - 1]; 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.