Status: New
Owner: ----
New issue 2568 by [email protected]: Array.prototype.map plucking
out "length" causes function to stick
http://code.google.com/p/v8/issues/detail?id=2568
Hello! I ran into this investigating a regression in our application's use
of underscore.js's pluck function. Here's a minimal repro test case:
// A short copy of _.pluck, which iterates through an array and returns
another array, containing the values of some key.
// e.g. pluck([{name: "Tom"}, {name: "Dick"}, {name: "Harry"}], "name") =>
["Tom", "Dick", "Harry"].
var pluck = function(a, key) { return a.map(function(item){ return
item[key]; }); };
// This line triggers the bug. Without this line, the pluck function works
as expected.
// This line should (and does) return [2, 2].
pluck([[0,0],[0,0]], 'length');
// This line should return [1,2], but returns [2,2].
pluck([[1,2],[3,4]], '0');
Piping this into d8 on v8 head prints out
2,2
2,2
I'd expect it to print out:
2,2
1,3
I can repro in Chrome Version 26.0.1410.19 beta, but not in Chrome 25.
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