> Yes, although it's not implemented in V8 just yet.
I was wrong (and happy about it)! This is working in the latest unstable
version of node/v8:
$ node -e 'console.log(process.versions.v8)'
3.20.2
$ node --harmony-iteration --harmony-generators
> function* gen() { yield 'foo'; yield 'bar'; }
undefined
> for (var item of gen()) { console.log(item); }
foo
bar
Awesome! Not sure how I missed that this was added...
On Tuesday, July 16, 2013 9:13:26 AM UTC-4, jmar777 wrote:
>
> > That for...of syntax is very nice, is it an official part of ECMAScript
> 6?
>
> Yes, although it's not implemented in V8 just yet. Once for-of and
> generator-expressions are implemented, a lot of these operations will
> become a lot nicer at the language level (rather than relying on cludgy
> `suspend.map()` or whatever helpers).
>
> Here's an example from the ES6 Wiki [1]:
>
> (xhrGet(url) for (url of getURLs())) // hawt
>
> [1] http://wiki.ecmascript.org/doku.php?id=harmony:generator_expressions
>
> On Tuesday, July 16, 2013 2:36:44 AM UTC-4, cpprototypes wrote:
>>
>> The code sample I posted was a simplified example to demonstrate the
>> issue. The actual command line script I was working on uses the response
>> from the get request for other things. That for...of syntax is very nice,
>> is it an official part of ECMAScript 6?
>>
>>
>> On Friday, July 12, 2013 2:47:28 PM UTC-7, cpprototypes wrote:
>>>
>>> I'm using node 0.11.3 with --harmony-generators to try the new feature.
>>> I found two libraries that should help use existing node callback-based
>>> code with generators (suspend and galaxy). The code I'm trying to run was
>>> similar to the following:
>>>
>>> (using suspend)
>>>
>>> var fs = require('fs');
>>> var request = require('request');
>>>
>>> suspend(function* (resume) {
>>> var contents = yield fs.readFile('idList.json', 'utf8', resume);
>>> contents.split('\n').forEach(function(id) {
>>> var info = yield request.get('http://www.example.com?id='+id,
>>> resume);
>>> });
>>> })();
>>>
>>> (using galaxy)
>>>
>>> var galaxy = require('galaxy');
>>> var fs = galaxy.star(require('fs'));
>>> var request = galaxy.star(require('request'));
>>>
>>> function* main() {
>>> var contents = yield fs.readFile('idList.json', 'utf8');
>>> contents.split('\n').forEach(function(id) {
>>> var info = yield request.get('http://www.example.com?id='+id);
>>> });
>>> };
>>>
>>> galaxy.unstar(main)(function(err, result) {
>>> console.log('done');
>>> });
>>>
>>> Using either library, when node tries to execute the get request ("var
>>> info = yield request.get...") it exits with the following error:
>>>
>>> SyntaxError: Unexpected identifier
>>>
>>> And the error highlights the "request" part in "var info = yield
>>> request.get..." I'm guessing that the creation of the new function scope
>>> in the forEach is somehow causing an issue. But I'm not sure why it's not
>>> working.
>>>
>>>
>>>
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