On Wed, Jul 17, 2013 at 8:42 AM, jmar777 <[email protected]> wrote: > > Here are the notes from the meeting when this was discussed: > https://github.com/**rwldrn/tc39-notes/blob/master/** > es6/2013-01/jan-31.md#**comprehensionsgenerator-syntax<https://github.com/rwldrn/tc39-notes/blob/master/es6/2013-01/jan-31.md#comprehensionsgenerator-syntax> > > Ahh, thanks for the clarification. So, hopefully correct this time, the > previous example should have really been: > > [for (url of getURLs()) xhrGet(url)] > > For a generator comprehension, you had the parens right, but yes, the order is now correct :)
(for (url of getURLs()) xhrGet(url)) Rick > ? > > On Tuesday, July 16, 2013 7:38:56 PM UTC-4, Rick Waldron wrote: >> >> >> >> >> On Tue, Jul 16, 2013 at 9:13 AM, jmar777 <[email protected]> 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<http://wiki.ecmascript.org/doku.php?id=harmony:generator_expressions> >>> >> >> Caution!!! >> >> *"This proposal has progressed to the Draft ECMAScript 6 Specification, >> which is available for review here: specification_drafts. Any new issues >> relating to them should be filed as bugs at http://bugs.ecmascript.org. >> The content on this page is for historic record only and may no longer >> reflect the current state of the feature described within"* >> >> I added this to every wiki proposal that is now in the spec—in this case, >> the generator expression syntax is backwards! >> >> In the spec draft... >> >> GeneratorComprehension : >> ( Comprehension ) >> >> >> And Comprehension is defined in ArrayComprehension >> >> Comprehension : >> ComprehensionFor ComprehensionQualifierTail >> >> ComprehensionQualifierTail : >> AssignmentExpression >> ComprehensionQualifier ComprehensionQualifierTail >> >> ComprehensionQualifier : >> ComprehensionFor >> ComprehensionIf >> >> ComprehensionFor : >> for (ForBinding of AssignmentExpression ) >> >> ComprehensionIf : >> if ( AssignmentExpression ) >> >> >> ForBinding : >> BindingIdentifier >> BindingPattern >> >> >> Here are the notes from the meeting when this was discussed: >> https://github.com/**rwldrn/tc39-notes/blob/master/** >> es6/2013-01/jan-31.md#**comprehensionsgenerator-syntax<https://github.com/rwldrn/tc39-notes/blob/master/es6/2013-01/jan-31.md#comprehensionsgenerator-syntax> >> >> >> Rick >> >> >> >> >>> 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(**f**unction(id) { >>>>> var info = yield request.get('http://www.**exampl** >>>>> e.com?id='+id <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(**f**unction(id) { >>>>> var info = yield request.get('http://www.**exampl** >>>>> e.com?id='+id <http://www.example.com?id='+id>); >>>>> }); >>>>> }; >>>>> >>>>> galaxy.unstar(main)(function(**e**rr, 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. >>>>> >>>>> >>>>> -- >>> -- >>> Job Board: http://jobs.nodejs.org/ >>> Posting guidelines: https://github.com/joyent/**node/wiki/Mailing-List-* >>> *Posting-Guidelines<https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines> >>> You received this message because you are subscribed to the Google >>> Groups "nodejs" group. >>> To post to this group, send email to [email protected] >>> >>> To unsubscribe from this group, send email to >>> nodejs+un...@**googlegroups.com >>> >>> For more options, visit this group at >>> http://groups.google.com/**group/nodejs?hl=en?hl=en<http://groups.google.com/group/nodejs?hl=en?hl=en> >>> >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "nodejs" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to nodejs+un...@**googlegroups.com. >>> >>> For more options, visit >>> https://groups.google.com/**groups/opt_out<https://groups.google.com/groups/opt_out> >>> . >>> >>> >>> >> >> -- > -- > Job Board: http://jobs.nodejs.org/ > Posting guidelines: > https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines > You received this message because you are subscribed to the Google > Groups "nodejs" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/nodejs?hl=en?hl=en > > --- > You received this message because you are subscribed to the Google Groups > "nodejs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups "nodejs" group. 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