https://github.com/fanqingsong/lazyman_idea

to demo lazy man in async && chain style
https://github.com/fanqingsong/lazyman_idea

async chain lazyman promise settimeout

Last synced: 10 days ago
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to demo lazy man in async && chain style

• Host: GitHub
• URL: https://github.com/fanqingsong/lazyman_idea
• Owner: fanqingsong
• Created: 2019-03-18T15:44:32.000Z (almost 6 years ago)
• Default Branch: master
• Last Pushed: 2019-03-18T16:03:26.000Z (almost 6 years ago)
• Last Synced: 2024-11-14T18:54:25.513Z (2 months ago)
• Topics: async, chain, lazyman, promise, settimeout
• Language: JavaScript
• Homepage:
• Size: 1.95 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# lazyman algorithm idea demo

## this project is for demo lazyman idea 

lazyman is meeted with chain style, and supports async operation in each chain logic

#install and run 

```

// see the promise version

npm run promise

// to see the primitive version

npm run primitive

```

# explain

usage code

Promise version

```

function _LazyMan(name) {

    this.promiseGetters = [];

    var makePromise = function  () {

        var promiseObj = new Promise(function(resolve, reject){

            console.log("Hi! This is " + name + "!");

            resolve();

        })

        return promiseObj;

    }

    this.promiseGetters.push(makePromise);

    // 在各个Promise的then函数中，将任务序列穿起来

    var self = this;

    var sequence = Promise.resolve();

    // Promise.resolve 等价于

    // var sequence = new Promise(function (resolve, reject) {

    //     resolve();

    // })

    setTimeout(function(){

        for (var i = 0; i < self.promiseGetters.length; i++) {

            var nowPromiseGetter = self.promiseGetters[i];

            var thenFunc = (function (nowPromiseGetter) {

                return function  () {

                    return nowPromiseGetter()

                }

            })(nowPromiseGetter);

            sequence = sequence.then(thenFunc);

        };

    }, 0); // 在下一个事件循环启动任务

}

_LazyMan.prototype.eat = function(name) {

    var makePromise = function  () {

        var promiseObj = new Promise(function(resolve, reject){

            console.log("Eat " + name + "~");

            resolve();

        })

        return promiseObj;

    }

    this.promiseGetters.push(makePromise);

    return this; // 实现链式调用

}

_LazyMan.prototype.sleep = function(time) {

    var makePromise = function  () {

        var promiseObj = new Promise(function(resolve, reject){

            setTimeout(function(){

                console.log("Wake up after " + time + "s!");

                resolve();

            }, time * 1000);

        })

        return promiseObj;

    }

    this.promiseGetters.push(makePromise);

    return this;

}

/* 封装 */

function LazyMan(name){

    return new _LazyMan(name);

}

LazyMan("Hank").sleep(1).eat("dinner")

```