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June 21, 2023 05:03
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Несколько способов удалить повторяющиеся элементы из массива на JavaScript
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*** 1. Использование объекта Set *** | |
const arr = [1, 1, 2, 2, 3, 4, 4, 5]; | |
const uniqueArr = [...new Set(arr)]; | |
console.log(uniqueArr); // [1, 2, 3, 4, 5] | |
*** 2. Использование метода .filter *** | |
const arr = [1, 1, 2, 2, 3, 4, 4, 5]; | |
const uniqueArr = arr.filter((item, index) => arr.indexOf(item) === index); | |
console.log(uniqueArr); // [1, 2, 3, 4, 5] | |
*** 3. Использование метода .reduce *** | |
const arr = [1, 1, 2, 2, 3, 4, 4, 5]; | |
const uniqueArr = arr.reduce((acc, curr) => { | |
if (!acc.includes(curr)) { | |
acc.push(curr); | |
} | |
return acc; | |
}, []); | |
console.log(uniqueArr); // [1, 2, 3, 4, 5] | |
*** 4. Использование метода .forEach *** | |
const arr = [1, 1, 2, 2, 3, 4, 4, 5]; | |
const uniqueArr = []; | |
arr.forEach((item) => { | |
if (!uniqueArr.includes(item)) { | |
uniqueArr.push(item); | |
} | |
}); | |
console.log(uniqueArr); // [1, 2, 3, 4, 5] | |
*** 5. Использование цикла for *** | |
const arr = [1, 1, 2, 2, 3, 4, 4, 5]; | |
const uniqueArr = []; | |
for (let i = 0; i < arr.length; i++) { | |
if (!uniqueArr.includes(arr[i])) { | |
uniqueArr.push(arr[i]); | |
} | |
} | |
console.log(uniqueArr); // [1, 2, 3, 4, 5] |
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