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forEach returns undefined for arrays begin do not with 0 #8510
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ne3Vubeki
changed the title
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it's not super clear what you're saying, could you provide a reproduction? |
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@ne3Vubeki - Perhaps you can start by updating this Plunker to show your problem: http://plnkr.co/edit/7B9cARoiM4Ti5DFTwLxA?p=preview |
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In principle, everything is shown: |
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okay, I see. You're right, this is the behaviour that Array.prototype.forEach would have, so it makes sense for us to do the same thing. I'll submit a patch u_u |
caitp
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Aug 7, 2014
…ing properties)
Array.prototype.forEach will not invoke the callback function if the properety is not present in the
object. Because of this, we have the illusion of not iterating over non-added properties in a sparse
array.
From ECMAScript:
9. Repeat while k < len
a. Let Pk be ToString(k).
b. Let kPresent be HasProperty(O, Pk).
c. ReturnIfAbrupt(kPresent).
d. If kPresent is true, then
i. Let kValue be Get(O, Pk)
... (steps for invoking the function and aborting if it throws)
Closes angular#8510
Closes angular#8522
caitp
added a commit
to caitp/angular.js
that referenced
this issue
Aug 7, 2014
…ing properties)
Array.prototype.forEach will not invoke the callback function if the properety is not present in the
object. Because of this, we have the illusion of not iterating over non-added properties in a sparse
array.
From ECMAScript:
9. Repeat while k < len
a. Let Pk be ToString(k).
b. Let kPresent be HasProperty(O, Pk).
c. ReturnIfAbrupt(kPresent).
d. If kPresent is true, then
i. Let kValue be Get(O, Pk)
... (steps for invoking the function and aborting if it throws)
Closes angular#8510
Closes angular#8522
caitp
added a commit
to caitp/angular.js
that referenced
this issue
Aug 7, 2014
…ing properties)
Array.prototype.forEach will not invoke the callback function if the properety is not present in the
object. Because of this, we have the illusion of not iterating over non-added properties in a sparse
array.
From ECMAScript:
9. Repeat while k < len
a. Let Pk be ToString(k).
b. Let kPresent be HasProperty(O, Pk).
c. ReturnIfAbrupt(kPresent).
d. If kPresent is true, then
i. Let kValue be Get(O, Pk)
... (steps for invoking the function and aborting if it throws)
Closes angular#8510
Closes angular#8522
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Version 1.2.21
If we pass an array:
it forEach returns 'undefined', as cycle is inserted:
for( var i = 0 .....)
Previous versions properly treated such arrays.
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