Algorithms
Mathematics
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Changed Array.from to the more modern spread syntax. Ppopulates with range of numbers rather than undefined.
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Allows us to use the direct value in map rather than index
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Allows us to use slice rather than subtracting 2 then adding back later
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Changed .some to .every so we don't have to deal with double negatives.
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Changed to math ceil as we always want the larger number. Some tests fail if rounded down as we need the upper limit to be inclusive.
function prime_checker(n) { return n <= 1 ? false : [...Array(Math.ceil(Math.sqrt(n))).keys()].slice(2).every((v) => n % v); };function prime_checker(n){return n <= 1 ? false : !Array.from({ length: Math.round(Math.sqrt(n)) - 2 }).some((v, i) => n % (i + 2)===0)}- function prime_checker(n) {
- return n <= 1 ? false : [...Array(Math.ceil(Math.sqrt(n))).keys()].slice(2).every((v) => n % v);
- };