If you want to use `yield` in nested functions you will have to use yield*
to and your nested functions need to be generators
```js
suspend(function* (resume) {
var contents = yield fs.readFile('idList.json', 'utf8', resume);
yield* each(contents.split('\n'), function* (id) {
var info = yield
request.get('http://www.example.com?id='+id<http://www.example.com/?id='+id>,
resume);
});
})();
// Generator friendly forEach for arrays
function* each(array, callback) {
for (var i = 0, l = array.length; i < l; i++) {
yield* callback(array[i]);
}
}
```
On Fri, Jul 12, 2013 at 2:56 PM, Rick Waldron <[email protected]>wrote:
>
>
>
> On Fri, Jul 12, 2013 at 5:47 PM, cpprototypes <[email protected]>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.
>>
>
>
> `yield` may not be used in the body of a regular function.
>
> Rick
>
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