crs1138/error-handling

This repo is to compare various error handling patterns in JS and TS. Each pattern has its own branch.

Error Handling

This repo is to compare various error handling patterns in JS and TS. Each pattern has its own branch.

Patterns

1. Then-Catch Pattern
2. Try-Catch Pattern
3. Mix'n'Match .catch Pattern
4. Async Wrapping Function - Single Level Pattern
5. Non-Async Wrapping Function - Single Level Pattern
6. Third Party Libraries

Then-Catch Pattern

getJoke()
    .then(joke  => console.log(joke))
    .catch(err => console.error(err))

Try-Catch Pattern

try {
    const joke = await getJoke()
    console.log(joke)
} catch (err) {
    console.error(err)
}

Mix'n'Match .catch Pattern

const joke = await getJoke().catch(err => { 
    console.error(err)
 })
console.log(joke)

Async Wrapping Function - Single Level Pattern

async function asyncWrap(promise) {
    try {
        const data = await promise
        return [data, undefined]
    } catch (err) {
        return [undefined, err]
}

(async () => {
    const [joke, err] = await asyncWrap(getJoke())
    if ( joke ) { console.log(joke) }
    if (err) { console.error(err) }
})()

Non-Async Wrapping Function - Single Level Pattern

function wrapIt(promise) {
    return Promise.allSettled([promise]).then(([{value, reason}]) => { 
        return [value, reason]
     })
}

const [joke, err] = wrapIt(getJoke())
 if ( joke ) { console.log(joke) }
 if (err) { console.error(err) }

Third Party Libraries

• mats852/doublet
• scopsy/await-to-js
• thelinuxlich/go-go-try