9 lines
308 B
JavaScript
9 lines
308 B
JavaScript
const isSorted = arr => {
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let direction = -(arr[0] - arr[1]);
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for (let [i, val] of arr.entries()) {
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direction = !direction ? -(arr[i - 1] - arr[i]) : direction;
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if (i === arr.length - 1) return !direction ? 0 : direction;
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else if ((val - arr[i + 1]) * direction > 0) return 0;
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}
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};
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module.exports = isSorted; |