9 lines
331 B
JavaScript
9 lines
331 B
JavaScript
const primes = num => {
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let arr = Array.from({ length: num - 1 }).map((x, i) => i + 2),
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sqroot = Math.floor(Math.sqrt(num)),
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numsTillSqroot = Array.from({ length: sqroot - 1 }).map((x, i) => i + 2);
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numsTillSqroot.forEach(x => (arr = arr.filter(y => y % x !== 0 || y === x)));
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return arr;
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};
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module.exports = primes;
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