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Ensure _.map rewrite handles objects with non-numeric length properties correctly.

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Former-commit-id: 60a4f322dcd284db5bb8ad4d8d5138e52e14cce3
This commit is contained in:
John-David Dalton
2012-10-22 01:56:50 -07:00
parent 1b0a77f9a8
commit 15f5b1f830
4 changed files with 40 additions and 27 deletions
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2
lodash.js
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@@ -2081,7 +2081,7 @@
function map(collection, callback, thisArg) {
var index = -1,
length = collection ? collection.length : 0,
result = Array(length);
result = Array(typeof length == 'number' ? length : 0);
callback = createCallback(callback, thisArg);
if (isArray(collection)) {

8
lodash.min.js vendored
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44
lodash.underscore.min.js vendored
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@@ -7,25 +7,25 @@
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w,l.select=k,l.tail=F,l.take=H,l.unique=q,z(l),l.prototype.chain=function(){return this.__chain__=n,this},l.prototype.value=function(){return this.__wrapped__},s("pop push reverse shift sort splice unshift".split(" "),function(e){var t=V[e];l.prototype[e]=function(){var e=this.__wrapped__;return t.apply(e,arguments),St&&e.length===0&&delete e[0],this.__chain__&&(e=new l(e),e.__chain__=n),e}}),s(["concat","join","slice"],function(e){var t=V[e];l.prototype[e]=function(){var e=t.apply(this.__wrapped__
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13
test/test.js
View File

@@ -41,6 +41,9 @@
/** Shortcut used to make object properties immutable */
var freeze = Object.freeze;
/** Used to set property descriptors */
var setDescriptor = Object.defineProperty;
/** Shortcut used to convert array-like objects to arrays */
var slice = [].slice;
@@ -946,6 +949,16 @@
});
deepEqual(actual, [1, 2, 3]);
});
test('should handle object arguments with non-numeric length properties', function() {
if (setDescriptor) {
var object = {};
setDescriptor(object, 'length', { 'value': 'x' });
deepEqual(_.map(object, _.identity), []);
} else {
skipTest();
}
});
}());
/*--------------------------------------------------------------------------*/