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nickserv/index.js

Last active September 5, 2022 13:33
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repeatItem
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index.js
const items = ['a', 'b', 'c', 'd']
const repeatItem = (item, times) => Array(times + 1).fill(item)
console.log(items.reduce((memo, item, index) => memo.concat(repeatItem(item, index)), []))
// ["a", "b", "b", "c", "c", "c", "d", "d", "d", "d"]
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