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electerious/duplicate.js

Created May 10, 2017 14:25
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Duplicate array items based on an array
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duplicate.js
const duplicate = (arr, duplications) => arr.reduce((acc, val, i) => {
const duplication = duplications[i]
for (let i = 0; i<duplication; i++) acc.push(val)
return acc
}, [])
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electerious commented May 10, 2017 •
edited
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Example:

duplicate(['a', 'b', 'c'], [0, 1, 2] // ['b', 'c', 'c']
duplicate(['a', 'b', 'c'], [0, 3, 0] // ['b', 'b', 'b']

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