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[JS][6kyu] Doors in the school #5205

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[JS][6kyu] Doors in the school #5205

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19 changes: 19 additions & 0 deletions codewars/6kyu/doors-in-the-school/koronya.js
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// [JS][6kyu] Doors in the school
// doors-in-the-school
// https://www.codewars.com/kata/57c15d314677bb2bd4000017/train/javascript

const doors = (n) => {
const arr = Array.from({ length: n }, () => false)
for (let i = 0; i < n; i += 1 || 0) {
let targetIndex = i
while (targetIndex < n) {
arr[targetIndex] = !arr[targetIndex]
targetIndex += i + 1
}
}
return arr.filter((door) => door).length
}

// doors(5) === 2
// doors(10) === 3
// doors(100) === 10