Status: New
Owner: ----
New issue 3377 by [email protected]: odd behavior of __proto__ with
Object.create(null) objects in an array
http://code.google.com/p/v8/issues/detail?id=3377
I was only able to get this to happen using an object when it is a member
in an array.
x=[{}]; i=0; x[i].__proto__ = {y:1}; x[i].__proto__
{ y: 1 }
o=Object.create(null)
{}
o.y = 2
2
x[i].__proto__ = o
{ y: 2 }
x[0].__proto__
undefined
x[0].__proto__.y
TypeError: Cannot read property 'y' of undefined
at repl:1:15
at REPLServer.defaultEval (repl.js:130:27)
at bound (domain.js:257:14)
at REPLServer.runBound [as eval] (domain.js:270:12)
at REPLServer.<anonymous> (repl.js:277:12)
at REPLServer.emit (events.js:107:17)
at REPLServer.Interface._onLine (readline.js:206:10)
at REPLServer.Interface._line (readline.js:535:8)
at REPLServer.Interface._ttyWrite (readline.js:816:14)
at ReadStream.onkeypress (readline.js:108:10)
x[0].y
2
x
[ {} ]
Object.keys(x[0])
[]
Note that the object doesn't have a "y" own-property, but it also seems to
not have a __proto__, so where is the y value coming from!?
This makes for a bunch of weird behavior in Node, because npm uses
prototype chains to manage config values.
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