Re: ES6 grammar for for-loops
Cyrus Najmabadi wrote: Ok. Thanks for confirming our read of the grammar. Is this shown on any breaking changes list anywhere? It should be -- who is maintaining such a list? Cc'ing Oliver, I believe he found a `for (var x = i in o)` use in the wild but it was evangelized successfully. Mike Taylor may have helped, cc'ing him too. /be ___ es-discuss mailing list es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss
Re: ES6 grammar for for-loops
On Feb 17, 2015, at 3:34 PM, Brendan Eich wrote: Cyrus Najmabadi wrote: Ok. Thanks for confirming our read of the grammar. Is this shown on any breaking changes list anywhere? It should be -- who is maintaining such a list? Cc'ing Oliver, I believe he found a `for (var x = i in o)` use in the wild but it was evangelized successfully. Mike Taylor may have helped, cc'ing him too. https://people.mozilla.org/%7Ejorendorff/es6-draft.html#sec-in-edition-6 and https://people.mozilla.org/%7Ejorendorff/es6-draft.html#sec-in-the-6th-edition the above is the 7th item on the second list. But I know, there are some things still missing from these lists so please file a bug if you know of a breaking change that is missing Allen___ es-discuss mailing list es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss
RE: ES6 grammar for for-loops
Ok. Thanks for confirming our read of the grammar. Is this shown on any
breaking changes list anywhere?
Thanks!
-- Cyrus
From: Leon Arnott [mailto:leonarn...@gmail.com]
Sent: Tuesday, February 17, 2015 5:04 AM
To: Cyrus Najmabadi
Cc: es-discuss
Subject: Re: ES6 grammar for for-loops
That line of code looks like it came directly from a test I wrote for kangax's
ES6 compatibility table.
Let's look at the test in its entirety:
```
try { eval('for (var i = 0 in {}) {}'); } catch(e) { return true; }
```
The grammer you describe is correct: ES6 no longer supports this useless form.
So, a conforming implementation must throw an error when the eval() string is
evaluated. If it does so, the test returns `true`, signifiying conforming
support.
I hope that answers your question - and pardon my presumptions if this test
code wasn't what you were thinking of at all.
-Leon.
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Re: ES6 grammar for for-loops
That line of code looks like it came directly from a test I wrote for
kangax's ES6 compatibility table.
Let's look at the test in its entirety:
```
try { eval('for (var i = 0 in {}) {}'); } catch(e) { return true; }
```
The grammer you describe is correct: ES6 no longer supports this useless
form. So, a conforming implementation must throw an error when the eval()
string is evaluated. If it does so, the test returns `true`, signifiying
conforming support.
I hope that answers your question - and pardon my presumptions if this test
code wasn't what you were thinking of at all.
-Leon.
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https://mail.mozilla.org/listinfo/es-discuss
