Created
July 7, 2019 11:38
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Async collector in javascript
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| export default class AsyncCollector { | |
| gotData = []; | |
| constructor(timeout, ...funcs) { | |
| return new Promise((resolve, reject) => { | |
| const promisesOfFuncs = funcs.map(item => item()); | |
| Promise.all(promisesOfFuncs) | |
| .then(values => this.gotData = values) | |
| .then(() => { | |
| setTimeout(() => { | |
| resolve(this.gotData); | |
| }, timeout); | |
| }); | |
| }); | |
| } | |
| } | |
| // Example of usage | |
| // function getImg() { | |
| // return new Promise((resolve, reject) => { | |
| // setTimeout(() => { | |
| // resolve("image"); | |
| // }, 500); | |
| // }); | |
| // } | |
| // function getText() { | |
| // return new Promise((resolve, reject) => { | |
| // setTimeout(() => { | |
| // resolve("text"); | |
| // }, 900); | |
| // }); | |
| // } | |
| // (async () => { | |
| // let dataFromServer = await new AsyncCollector(1000, getImg, getText); | |
| // console.log(dataFromServer); | |
| // })(); |
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In what situations might it be useful? Imagine you need to get a data from server A and server B, and you want to combine these datas in an array. So here it is. Collector!