promise.chain v1.0.3

promise.chain

Javascript promise.chain module

How to use

npm install promise.chain

Reduce Promise depth

Using Promise

function asyncProcess() {

    return asyncProcess1().then(result1 => {

        let promise;

        if( result1 )
            promise = asyncProcess2();
        else
            promise = asyncProcess3()
                .then(() => asyncProcess4())
                .then(() => asyncProcess5())
                .then(() => asyncProcess6());

        return promise.then(() => asyncProcessCommon());
        
    }).then(result => {
        // next something..
    }).catch(err => {
        // error handling
    });

}

Using promise.chain

const PromiseChain = require('promise.chain');

function asyncProcess() {

    const oChain = new PromiseChain();

    oChain.then = () => asyncProcess1();
    oChain.then = result1 => {

        const oSubChain = new PromiseChain();

        if( result1 )
            oSubChain.then = () => asyncProcess2();
        else {
            oSubChain.then = () => asyncProcess3();
            oSubChain.then = () => asyncProcess4();
            oSubChain.then = () => asyncProcess5();
            oSubChain.then = () => asyncProcess6();
        }

        oSubChain.then = () => asyncProcessCommon();

        return oSubChain;
        
    };
    oChain.then = result => {
        // next something..
    };
    oChain.catch = err => {
        // error handling
    };

    return oChain;

}

License

MIT License

Copyright (c) 2016 Bum-Seok Hwang

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.