@mapogolions/act
v1.1.3
Published
Inspired by [do](https://github.com/metarhia/do)
Downloads
13
Readme
act
Inspired by do
How to install
npm i @mapogolions/act
Usage
How to use with CPS
const fs = require('fs')
const path = require('path')
function readFileAsJson(filename, encoding, next) {
fs.readFile(filename, encoding, (err, content) => {
if (err) {
next(err)
return;
}
try {
const obj = JSON.parse(content)
next(null, obj)
} catch (err) {
next(err)
}
});
}
function done(err, result) {
if (err) {
console.error(err.message)
return;
}
console.log(result);
}
act(readFileAsJson, path.join(__dirname, 'package.json'), 'utf-8').call(null, done)
How to use with Promise
const fs = require('fs').promises
const path = require('path')
function readFileAsJson(filename, encoding, next) {
fs.readFile(filename, encoding)
.then(content => next(null, JSON.parse(content)))
.catch(next)
}
function done(err, result) {
if (err) {
console.error(err.message)
return;
}
console.log(result);
}
act(readFileAsJson, path.join(__dirname, 'package.json'), 'utf-8').call(null, done)
Reusable blocks
const fs = require('fs')
const path = require('path')
function parseContent(content, next) {
setTimeout(() => {
console.log('called once')
try {
next(null, JSON.parse(content))
} catch (err) {
next(err)
}
})
}
function getSetting(key, settings, next) {
// the second argument (settings) will be provided by the `parseContent`
setTimeout(next, 0, null, settings[key])
}
function done(err, result) {
if (err) {
console.error(err.message)
return;
}
console.log(result);
}
// define block
const readSettings = act(fs.readFile, path.join(__dirname, 'package.json'), 'utf-8')
.act(parseContent)
.once()
// Note that if we DO NOT call `once` then fs.readFile and parseContent will be called for each branch
// `Once` caches the result and reuses it across branches
// Whether or not to use this kind of optimization depends on your task.
// In this example, `once` helps to avoid double reading and parsing
readSettings.act(getSetting, 'license').call(null, done)
readSettings.act(getSetting, 'version').call(null, done)
Also see unit tests for more details