Wunsch

Class with Promise featured methods. Ability to wrapp methods and use async methods in sync way

Install

npm install wunsch-mixin --save

How to create

You can create new wunsch object:

const Wunsch = require('wunsch-mixin');
const wObj = new Wunsch;

Or extend as class:

const Wunsch = require('wunsch-mixin');
const wClass = class extends Wunsch{
    // ...
}

const wObj = new wClass()
// ... do stuff with wObj

Or you can mutate existing object:

const Wunsch = require('wunsch-mixin');
const someObj = {};

Wunsch.extend(someObj);
// ... do stuff with someObj

Example How to Use

For example we have two async methods.

wObj.asyncMethod1 = function(cb){
    if(!cb) return this.promise(this.asyncMethod1);

    setTimeout(()=>{
        console.log('Method 1');
        cb('some args');
    }, 2000);
}

wObj.asyncMethod2 = function(cb){
    if(!cb) return this.promise(this.asyncMethod2);

    setTimeout(()=>{
        console.log('Method 2');
        cb('some args');
    }, 3000);
}

Then we want to use them one after another, in right sequence. Also we can handle the end of the sequence by sync method .then(fn) or async .promise(fn). To catch error while processing methods, can be provided .catch(fn) method.

wOjb.asyncMethod1()
    .asyncMethod2()
    .promise(cb=>{
        console.log('Custom Promise');
        setTimeout(cb, 1000);
    })
    .then(()=>{
        console.log('The End!');
    })
    .catch(err=>{
        console.error('Error:', err);
    });

Result:

Method 1
Method 2
Custom Promise
The End!

Test Examples

1)

Wunsch = require('./index.js')
var obj = {};
obj.test = function(cb){ if(!cb) return this.promise(obj.test); setTimeout(()=>{console.log('100!'); cb('100!')}, 1000);}
obj.test2 = function(cb){ if(!cb) return this.promise(obj.test2); setTimeout(()=>{console.log('200!'); cb('200!')}, 2000);}
Wunsch.extend(obj);
obj.test().test2().then(console.log('End!')).catch(e=>{console.log('Promise Failed', e)});