Promises

Promises

"Im going to give you the best video on promises"

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let p = new Promise((resolve, reject) => {
    let a = 1 + 1
    if (a == 2) {
        resolve('Success')
    } else {
        reject('Failed')
    }
}) 

1+1 will always = 2 so the resolve() method is called.

so if the promise is going to be resolved and we keep our promise of delivering a great video, THEN we resolve the promise.

this is also basically a try catch block but without the finally

p.then((message) => {
    console.log('This is in the then' + message)
}).catch((message) => {
    console.log('This is in the catch' + message)
})

Promises are things you want to happen in the background but that take a long time. like downloading an image in a server and not making other things wait for it.

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Children

1. Batching Promise Execution
2. Callbacks
3. Return Quickest Completed Item

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Backlinks

• Ecmascript 2015 (DevLog)