source: trip-planner-front/node_modules/inflight/README.md@ 571e0df

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1# inflight
2
3Add callbacks to requests in flight to avoid async duplication
4
5## USAGE
6
7```javascript
8var inflight = require('inflight')
9
10// some request that does some stuff
11function req(key, callback) {
12 // key is any random string. like a url or filename or whatever.
13 //
14 // will return either a falsey value, indicating that the
15 // request for this key is already in flight, or a new callback
16 // which when called will call all callbacks passed to inflightk
17 // with the same key
18 callback = inflight(key, callback)
19
20 // If we got a falsey value back, then there's already a req going
21 if (!callback) return
22
23 // this is where you'd fetch the url or whatever
24 // callback is also once()-ified, so it can safely be assigned
25 // to multiple events etc. First call wins.
26 setTimeout(function() {
27 callback(null, key)
28 }, 100)
29}
30
31// only assigns a single setTimeout
32// when it dings, all cbs get called
33req('foo', cb1)
34req('foo', cb2)
35req('foo', cb3)
36req('foo', cb4)
37```
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