21 lines
660 B
JavaScript
21 lines
660 B
JavaScript
module.exports = chain
|
|
var bindActor = require("./bind-actor.js")
|
|
chain.first = {} ; chain.last = {}
|
|
function chain (things, cb) {
|
|
var res = []
|
|
;(function LOOP (i, len) {
|
|
if (i >= len) return cb(null,res)
|
|
if (Array.isArray(things[i]))
|
|
things[i] = bindActor.apply(null,
|
|
things[i].map(function(i){
|
|
return (i===chain.first) ? res[0]
|
|
: (i===chain.last)
|
|
? res[res.length - 1] : i }))
|
|
if (!things[i]) return LOOP(i + 1, len)
|
|
things[i](function (er, data) {
|
|
if (er) return cb(er, res)
|
|
if (data !== undefined) res = res.concat(data)
|
|
LOOP(i + 1, len)
|
|
})
|
|
})(0, things.length) }
|