coone

Acts like co@3 and also is drop-in replacement for it. Built on top of merz, actually thanks to always-done. But accept everything, not only generators - sync functions, async functions, callbacks and more. Flow-control for now and then.

Install

npm i coone --save

Usage

For more use-cases see the tests or try examples

coone

Co-ify everything!

• <val> {Function|GeneratorFunction|Stream|Promise} anything that merz accepts
• return {Function} which accepts only callback (thunk)

Example

const coone = require('coone')

Generators

Same as in co@3, but better.

const fs = require('fs')
 
/**
 * readFile
 */
 
function read (fp) {
  return (done) => {
    fs.readFile(fp, 'utf8', done)
  }
}
 
coone(function * () {
  const data = yield read('package.json')
  return JSON.parse(data)
})((err, json) => {
  if (err) return console.error(err)
  console.log(json.name) // => 'coone'
})

JSON.stringify

Specific use-case which shows correct and working handling of optional arguments.

coone(JSON.stringify, {foo: 'bar'})((err, data)=> {
  if (err) return console.error(err)
  console.log(data) //=> {"foo":"bar"}
})
 
// result with identation
coone(JSON.stringify, {foo: 'bar'}, null, 2)((err, data) => {
  if (err) return console.error(err)
  console.log(data)
  // =>
  // {
  //   "foo": "bar"
  // }
})

callback-style and sync functions

Again, showing correct handling of optinal arguments using native fs module.

const fs = require('fs')
 
// callback function
coone(fs.stat, 'package.json')((err, res) => {
  if (err) return console.error(err)
  console.log(res.isFile()) //=> true
})
 
// correct handling of optional arguments
coone(fs.readFile, 'package.json')((err, buf) => {
  if (err) return console.error(err)
  console.log(Buffer.isBuffer(buf)) //=> true
})
 
// read json file and parse it,
// because it will be utf8 string
coone(fs.readFileSync, 'package.json', 'utf-8')((err, data) => {
  if (err) return console.error(err)
  console.log(data.name) //=> 'coone'
})

flatten multiple arguments by default

If you pass more than two arguments to the callback, they will be flattened by default.

coone((one, two, cb) => {
  cb(null, one, two, 33)
}, 11, 22)((err, res) => {
  if (err) return console.error(err)
  console.log(Array.isArray(res)) //=> true
  console.log(res) //=> [11, 22, 33]
})

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.
But before doing anything, please read the CONTRIBUTING.md guidelines.

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