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callback-sequence
Advanced tools
Readme
Make a new callback to run callbacks in sequence or parallel.
Callbacks can be made async like gulp tasks.
var thunkify = require('callback-sequence')
var Readable = require('stream').Readable
var gulp = require('gulp')
gulp.task('sequence', thunkify(
sync, async, promise, stream
))
gulp.task('parallel', thunkify(
[sync, async, promise, stream]
))
gulp.task('parallel-nested', thunkify(
// `async` and `promise` will be run in parallel
sync, [async, promise], stream
))
gulp.task('sequence-nested', thunkify(
// `async` and `promise` will be run in sequence
[sync, [async, promise], stream]
))
function sync() {
}
function async(cb) {
process.nextTick(cb)
}
function promise() {
return Promise.resolve()
}
function stream() {
var s = Readable()
s.push(null)
return s
}
var Runner = require('./lib/runner')
var runner = new Runner({ input: false, output: false })
exports = module.exports = runner.thunkify.bind(runner)
exports.run = exports.sequence = runner.sequence.bind(runner)
exports.parallel = runner.parallel.bind(runner)
exports.series = runner.series.bind(runner)
exports.Runner = Runner
var runner = Runner(opts)
Create a new runner instance.
Specify whether to pass the results of the previous callback to the next as arguments.
Type: Boolean
Default: true
var Runner = require('callback-sequence').Runner
var runner = Runner({ input: true })
runner.thunkify(
function (a, b) {
// 3
return a + b
},
function (sum, next) {
process.nextTick(function () {
// 6
next(null, sum * 2)
})
},
function (product) {
return Promise.resolve().then(function () {
// 7
return product + 1
})
}
)(1, 2)
.then(function (res) {
// [7]
console.log(res)
})
Specify whether to deliver results.
Type: Boolean
Default: true
If false
, the final results will always be []
.
Specify a runner function to run each callback.
Type: Function
, Object
Default: null
If Function
, it receives a callback followed by a list of arguments,
and should return a promise to fetch the results (Array
).
If Object
, it is passed to
Runner of run-callback
to create a runner function.
Return a callback to run the specified tasks in the appearance order.
var runner = Runner()
runner.thunkify(
function (res) {
return res + 1
},
function (res) {
return Promise.resolve()
.then(function () {
return res + 1
})
},
function (res, next) {
process.nextTick(function () {
next(null, res - 1, res + 1)
})
}
)(1)
.then(function (res) {
// [ 2, 4 ]
console.log(res)
})
Run tasks
in sequence.
NOTE: directly nested array of tasks will be run with Runner.prototype.parallel
.
var runner = Runner()
runner.sequence([
function () { console.log(1) },
[
function (cb) {
setTimeout(function() {
console.log(3)
cb()
}, 0)
},
function () {
return new Promise(function (resolve) {
process.nextTick(function () {
console.log(2)
resolve()
})
})
},
],
function () { console.log(4) },
]).then(function () {
console.log('DONE')
})
// 1
// 2
// 3
// 4
// DONE
Callbacks can be added dynamically:
var runner = Runner()
var count = 5
var tasks = []
var res = []
function task(next) {
process.nextTick(function () {
res.push(count)
if (--count > 0) {
tasks.push(task)
}
next()
})
}
runner.sequence(tasks).then(function () {
// [5, 4, 3, 2, 1]
console.log(res)
})
tasks.push(task)
Run the specified tasks in parallel.
NOTE: directly nested array of tasks will be run with Runner.prototype.sequence
.
var runner = Runner()
var res = []
runner.parallel([
function () { res.push(1) },
[
function () {
return Promise.resolve().then(function () {
res.push(4)
})
},
function () { res.push(5) },
],
function (cb) {
setTimeout(function() {
res.push(3)
cb()
}, 0)
},
function (cb) {
res.push(2)
cb()
},
])
.then(function () {
// [1, 2, 4, 5, 3]
console.log(res)
})
Run tasks
in sequence.
However, while the results of sequence
is that of the last task,
the results of series
is an array containing all results of the tasks.
In addition, the results of the previous task will not be passed to the next as arguments.
NOTE: each element will be passed to Runner.prototype.sequence
.
var runner = Runner()
runner.series(
function () {
console.log(1)
return 1
},
[
function () {
return Promise.resolve().then(function () {
console.log(4)
return 4
})
},
function (cb) {
setTimeout(function() {
console.log(3)
cb(null, 3)
}, 0)
},
function () {
console.log(5)
return 5
},
],
function (cb) {
console.log(2)
cb(null, 2)
}
)
.then(function (res) {
// 1
// 5
// 4
// 3
// 2
// [ [ 1 ], [ [ 4 ], [ 3 ], [ 5 ] ], [ 2 ] ]
console.log(res)
})
FAQs
Make a new callback to run input callbacks in sequence
The npm package callback-sequence receives a total of 37 weekly downloads. As such, callback-sequence popularity was classified as not popular.
We found that callback-sequence demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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