promise-waterfall extends promise utilities with sequential flow control like async.waterfall
npm install promise-waterfallSince Promise.all(promiseArr) || Promise.spread(promiseArr) execs promises simultaneously, each of the functions in the promiseArr cannot depend on another, and if you want promises execute in order or some of the promises need the resolved value of another, this library is for you.
npm install promise-waterfalljavascript
var waterfall = require("promise-waterfall");
var func1 = function(){
// return a promise
},
func2 = function(res1){
// optionally use res1
// which is resolved from func1
// and return a promise
},
func3 = function(res2){
// like func2
},
promiseSequence = [func1, func2, func3];
waterfall(promiseSequence)
// the promiseSequence will executes sequentially
// just like func1().then(func2).then(func3)
.then(function(res){
// use res
})
.catch(function(err){
// deal with error
});
`
See test cases in for full examples.Development
$3
run npm test or make test`