var promisify = require('deferred').promisify;
var myAsyncFunctionPromiseVersion = promisify(myAsyncFunction);
myAsyncFunctionPromiseVersion().then(function () { console.log("it works!"); });
On 21 paź 2013, at 21:57, Reza Razavipour <[email protected]> wrote:
> Let us use an example:
>
>
>
> var q = require('q');
> var myAsyncFunction = function(err, result) {
>
> if (err)
>
> console.log("We got an error");
>
>
>
> console.log("Success");
>
> };
>
> myAsyncFunction().then(function () { console.log("promise is working");
> });
>
>
>
> myAsyncFunction().then(function () { console.log("it really worked"); });
>
> ^
>
>
> TypeError: Cannot call method 'then' of undefined
>
>
>
> How do I turn myAsyncFunction into a promise?
>
>
>
>
>
> On Monday, October 21, 2013 10:58:34 AM UTC-7, Mariusz Nowak wrote:
>
> On 21 paź 2013, at 19:52, Reza Razavipour <[email protected]> wrote:
>
>> we all of this I still can not figure out how to take an async function and
>> change it from callback to a promise.
>
>
> Many libraries provide it's own utils for that, just check their
> documentation:
>
> https://github.com/kriskowal/q#adapting-node
> https://github.com/medikoo/deferred#promisify---working-with-asynchronous-functions-as-we-know-them-from-nodejs
> https://github.com/petkaantonov/bluebird/blob/master/API.md#promisepromisifyfunction-nodefunction--dynamic-receiver---function
>
>
>>
>> 1. Do I have to declare a promise before I can call a 'then' on it? Every
>> time I do not and call a then on an async function, I get a syntax error.
>>
>>
>>
>> On Friday, October 18, 2013 3:11:47 PM UTC-7, Reza Razavipour wrote:
>> I am a fairly new to javaScript and node.js both.
>>
>> I am trying to wrap my head around promises and I am having a hard time. I
>> am looking for a very simple tutorial/video on this topic and having little
>> success.
>>
>> Is there a reference that can be recommended? A before and after code
>> snippet can be a good starting position.
>>
>> Reza
>>
>>
>>
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