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[JS][8kyu] Find the first non-consecutive number #5358

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[JS][8kyu] Find the first non-consecutive number #5358

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21 changes: 21 additions & 0 deletions codewars/8kyu/find-the-first-non-consecutive-number/koronya.js
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Original file line number Diff line number Diff line change
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// [JS][8kyu] Find the first non-consecutive number
// find-the-first-non-consecutive-number
// https://www.codewars.com/kata/58f8a3a27a5c28d92e000144/train/javascript

const firstNonConsecutive = (arr) => {
const arrLen = arr.length
let prev = arr[0]
for (let i = 1; i < arrLen; i += 1) {
const now = arr[i]
if (now - prev !== 1) {
return arr[i]
}
prev = now
}
return null
}

firstNonConsecutive([1, 2, 3, 4, 6, 7, 8]) === 6
firstNonConsecutive([1, 2, 3, 4]) === null