In JS, using regex:
const isPrime = x=>!'1'.repeat(x).match(/^1?$|^(11+?)\1+$/)
that's evil, I love it 😍
Would you like to explain it?
I didn't write it, but it's fascinating... noulakaz.net/2007/03/18/a-regular-...
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In JS, using regex:
that's evil, I love it 😍
Would you like to explain it?
I didn't write it, but it's fascinating... noulakaz.net/2007/03/18/a-regular-...