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JavaScript error handling with better `dx`

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[前端(javascript) 所属分类 前端(javascript) | 发布者 店小二04 | 时间 2018 | 作者 红领巾 ] 0人收藏点击收藏

javascript expects you to handle errors with try...catch , but the syntax is somewhat inconvenient:

1. You have to declare result variables separately from your function calls.

const userInput = 'fail' let json try { json = JSON.parse(userInput) } catch (err) { console.error(err.stack) } // Do something with `json`...

Since we declare json separately, we can't declare json as a const binding.

2. try...catch promotes catch-all error handling.

try { // A bunch of stuff happens... // ... // ... } catch (err) { console.log('welp') console.error(err.stack) }

You might want to handle errors in a more fine-grained way. But then you run into the verbosity of problem 1.

Enter dx

dx is a micro utility (it's just a few lines) that addresses the two pain points above.

import { dx } from '@nucleartide/dx' const [res, err] = dx(JSON.parse)('invalid json') if (err) { console.error(err.stack) }

It allows you to place your declaration and function call on the same line. And it promotes a granular, per-function error handling style.

It also works with async functions:

import { dx } from '@nucleartide/dx' function asyncHello(name) { return Promise.reject(`hello ${name}`) } ;(async () => { const [res, err] = await dx(asyncHello)('jesse') if (err) { console.error(err.stack) } }) Convinced?

Try it out and lemme know what you think! Also feel free to check out the source .

npm install @nucleartide/dx

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