30-seconds-of-code
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A collection of useful JavaScript snippets.
19 lines (14 loc) • 447 B
Markdown
Checks if the provided integer is a prime number.
Check numbers from `2` to the square root of the given number.
Return `false` if any of them divides the given number, else return `true`, unless the number is less than `2`.
```js
const isPrime = num => {
const boundary = Math.floor(Math.sqrt(num));
for (var i = 2; i <= boundary; i++) if (num % i === 0) return false;
return num >= 2;
};
```
```js
isPrime(11); // true
```