What's the equivalent of jQuery.when() in nodejs?

Question

I asked whats the equivalent of jquery when in angular and now I want to do similar thing in node. I need to something like this:

when(fs.readFile('file1'), fs.readFile('file2')) .done(function( a1, a2 ) { ... // do stuff });

How can I achieve this? Thanks.

score 2 · Accepted Answer · edited May 23 '17 at 10:27

2

You need node 0.11.13 or higher for this to work or to use a library but that would be Promise.all:

var Promise = require("bluebird"); // Imports the Bluebird promise library in 
                                   // new versions of node this is optional

Promise.promisifyAll(fs); // this is required if using Bluebird, you'll have to 
                          // do this manually with native promises.
Promise.all([fs.readFileAsync('file1'), fs.readFileAsync('file2')])
.spread(function( a1, a2 ) {
   ... // do stuff
});

As for how to convert a callback API to promises - see this question and answer.

edited May 23 '17 at 10:27

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answered Aug 17 '14 at 13:02

Benjamin Gruenbaum

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@LeonidBeschastny right, but in new versions of node promises _ship as a part of Node_ since they're accepted into the new JavaScript standard. In node 0.12 promises will work out of the box. Bluebird in particular works on Netscape 7, so Node 0.8 isn't really a challenge :) – Benjamin Gruenbaum Aug 17 '14 at 13:07
Promises work in any node.js vesion, or at least since `0.8.x`. – Leonid Beschastny Aug 17 '14 at 13:07
How did our comments get inverted :S? – Benjamin Gruenbaum Aug 17 '14 at 13:07
I accidentally deleted my comment. – Leonid Beschastny Aug 17 '14 at 13:08

What's the equivalent of jQuery.when() in nodejs?

1 Answers1