Javascript Promise simple examples

gistfile1.txt

const sumPromise = (a,b) => {
	const p = new Promise((resolve, reject) =>{
		if(typeof a === 'number' && typeof b === 'number'){
			resolve(a+b)
		} else {
			reject(new Error('Tip düzgün deyil'))
		}
	})


	return p
}

const timerPromise = (time=1000, name) =>{
	const p = new Promise((resolve, reject) =>{
		setTimeout(()=>{
			if(name!=='p1')
				resolve(name)
			else reject('P1 not found')
		}, time)
	})
	return p
}

// Pending
const p1 = sumPromise(3,5)
const p2 = sumPromise('4',4) // here is an error
const p3 = sumPromise(100,200)

const t1 = timerPromise(100, 'p1') // here is an error
const t2 = timerPromise(2000, 'p2')
const t3 = timerPromise(1000, 'p3')

Promise.race([p1,p2,p3])
.then(val => console.log(val)) // fullfilled
.catch(err => console.warn(err)) // rejected


// .all hamısı fullfilled olmalıdır
// .allSettled hamısı settled olduqdan sonra
// .race İlk cavabı qaytar (xəta olsa belə)
// .any ilk fullfilled olanı qaytar



const getSum = async() =>{
	try{
		const p2 = sumPromise(5,4)
		const p3 = sumPromise(100,200)
		const p1 = sumPromise(30,50)

		const allCorrect =  Promise.all([p2, p3, p1])
		console.log(allCorrect)
	}catch(err){
		console.warn(err.message)
	}
}

getSum()



const getTimerAsync = async function(){
	const timer = await timerPromise(1000, 'timer')
	console.log(timer)
}

getTimerAsync()