th
v0.1.1
Published
th.en - make it painless to adapt between callbacks and promises
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then
make it painless to adapt between callbacks and promises
usage
then
is like a magic portal to warp between Promised land and the firey depths of Callback hell.
var then = require('th')
var fs = require('fs')
fs.readFile('./tmp', then())
then(function (file) {
console.log('file')
}, function (err) {
console.log('errors!', err)
})
// although you may want to be using streaming file methods, anyhow
When we invoke then()
the first time, it creates a callback to give to fs.readFile
. When we call it the next time, it's like a Promises/A+ then
method.
Importantly, there are times when we want to go back from a chain of promises to a callback:
function (err, nextCb) {
if (err) { return nextCb(err) }
var promise = myPromise()
.then(someStep)
.then(oneMoreThing)
then.callback(promise, nextCb)
}
api
then : () => Promise | (resolved: Function, rejected: Function) => Promise
See usage note above for behavior.
then.callback(Promise<T>, Callback<T>) => void
Registers the callback
as a handler for promise resolve
and reject
events.
installation
$ npm install th
running the tests
From package root:
$ npm install
$ npm test
contributors
- jden [email protected]
license
MIT. (c) MMXIII AgileMD http://agilemd.com