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Make _.head avoid accessing array when its length is 0.

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John-David Dalton
2016-04-11 17:30:15 -07:00
parent 93168e6018
commit 091b5fbe30
2 changed files with 4 additions and 5 deletions
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2
lodash.js
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@@ -6415,7 +6415,7 @@
* // => undefined * // => undefined
*/ */
function head(array) { function head(array) {
return array ? array[0] : undefined; return (array && array.length) ? array[0] : undefined;
} }
/** /**

7
test/test.js
View File

@@ -7386,10 +7386,9 @@
QUnit.test('should return `undefined` when querying empty arrays', function(assert) { QUnit.test('should return `undefined` when querying empty arrays', function(assert) {
assert.expect(1); assert.expect(1);
var array = []; arrayProto[0] = 1;
array['-1'] = 1; assert.strictEqual(_.head([]), undefined);
arrayProto.length = 0;
assert.strictEqual(_.head(array), undefined);
}); });
QUnit.test('should work as an iteratee for methods like `_.map`', function(assert) { QUnit.test('should work as an iteratee for methods like `_.map`', function(assert) {