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30-seconds-of-code/snippets/isPrime.md
Stefan Feješ f50e2f9880 add isPrime
2017-12-19 21:35:56 +01:00

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### isPrime
Checks if the provided intiger is primer number.
Returns `false` if the provided number has positive divisors other than 1 and itself or if the number itself is less than 2.
```js
const isPrime = num =>
for (var i = 2; i < num; i++) if (num % i == 0) return false;
return num >= 2;
// isPrime(11) -> true
// isPrime(12) -> false
// isPrime(1) -> false
```