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const array = [ | |
1, 2, 3, 4, | |
]; | |
const createAsyncfunction = number => new Promise((resolve, reject) => { | |
const tiemout = Math.floor(Math.random() * Math.floor(10)); | |
if (number === 3) reject('Bad number'); | |
else { | |
setTimeout(() => { | |
console.log('number is printed: ', number); | |
resolve(); | |
}, tiemout * 1000); | |
} | |
}); | |
const createFailCatcher = func => async (...items) => { | |
try { | |
await func(...items); | |
} catch (e) { | |
console.log('error is: ', e); | |
} | |
}; | |
// ---------- end of utils | |
const asyncFucntionWithCatch = createFailCatcher(createAsyncfunction); | |
const forEach = (func, array) => { | |
array.forEach(async (item) => { | |
await func(item); | |
}); | |
}; | |
const reduce = (func, array) => { | |
array | |
.reduce(async (promise, arrayItem) => { | |
await promise; | |
return func(arrayItem); | |
}, Promise.resolve()); | |
}; | |
const promiseAll = async (func, array) => { | |
await Promise.all(array.map((item) => func(item))); | |
}; | |
const recursive = (func, array) => { | |
let iterator = 0; | |
const reducer = async () => { | |
if (iterator < array.length) { | |
await func(array[iterator]); | |
iterator++; | |
return reducer(); | |
} | |
console.log('end'); | |
}; | |
reducer(); | |
}; | |
// console.log(forEach(asyncFucntionWithCatch, array)); | |
// console.log(reduce(asyncFucntionWithCatch, array)); | |
// console.log(promiseAll(asyncFucntionWithCatch, array)); | |
// console.log(recursive(asyncFucntionWithCatch, array)); |
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