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2017-12-28 08:30:19 +00:00
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snippets/primes.md
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@ -6,14 +6,14 @@ Generate an array from `2` to the given number. Use `Array.filter()` to filter o
```js
const primes = num => {
let arr = Array.from({length: num - 1}).map((x, i) => i + 2),
let arr = Array.from({ length: num - 1 }).map((x, i) => i + 2),
sqroot = Math.floor(Math.sqrt(num)),
numsTillSqroot = Array.from({length: sqroot - 1}).map((x, i) => i + 2);
numsTillSqroot.forEach(x => arr = arr.filter(y => ((y % x) !== 0) || (y == x)));
numsTillSqroot = Array.from({ length: sqroot - 1 }).map((x, i) => i + 2);
numsTillSqroot.forEach(x => (arr = arr.filter(y => y % x !== 0 || y == x)));
return arr;
};
```
```js
primes(10) // [2,3,5,7]
primes(10); // [2,3,5,7]
```