mk-promise - don't use callbacks - use promises
Installation
npm i mk-promise
Example - without error-handling
// require mk-promise
const promify = require('mk-promise')
// an example function with callback
function asyncFunction(value1, value2, callback) {
callback(value1 + value2, 'another value')
}
// make a promise that resolves when the callback gets called
promify(asyncFunction, 10, 5).then(r => {
console.log(r[0] === 15) //true
})// require mk-promise
const promify = require('mk-promise')
// an example function with callback
function asyncFunction(value, callback) {
if(typeof value === 'number') {
callback(value + 1)
} else {
//first argument of the callback is an error
callback(new Error('horrible things happened'))
}
}
//make a promise that gets rejected
promify(asyncFunction, false).withError().catch(error => {
console.log(error) //horrible things happened
})
//this promise gets resolved
promify(asyncFunction, 100).withError().then(r => {
console.log(r[0] === 101) //true
})makePromise(asyncFn, ...args)
- asyncFn <Function> - asynchronous function that needs a callback as last argument
- ...args <any> - arguments for asyncFn
returns <SpecialPromise>
Class: SpecialPromise
This class extends Promise. You can use the default '.then()' and '.catch()' methods.
promise.withError()
returns a <Promise>. If the first argument (converted to a Boolean) is true, the promise gets rejected with the first argument.