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Angelos Chalaris
2017-12-14 14:53:37 +02:00
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* [Chain asynchronous functions](#chain-asynchronous-functions) * [Chain asynchronous functions](#chain-asynchronous-functions)
* [Check for palindrome](#check-for-palindrome) * [Check for palindrome](#check-for-palindrome)
* [Chunk array](#chunk-array) * [Chunk array](#chunk-array)
* [Collatz algorithm](#collatz-algorithm)
* [Compact](#compact) * [Compact](#compact)
* [Count occurrences of a value in array](#count-occurrences-of-a-value-in-array) * [Count occurrences of a value in array](#count-occurrences-of-a-value-in-array)
* [Current URL](#current-url) * [Current URL](#current-url)
@ -230,6 +231,17 @@ const chunk = (arr, size) =>
// chunk([1,2,3,4,5], 2) -> [[1,2],[3,4],5] // chunk([1,2,3,4,5], 2) -> [[1,2],[3,4],5]
``` ```
[⬆ back to top](#table-of-contents)
### Collatz algorithm
If `n` is even, return `n/2`. Otherwise return `3n+1`.
```js
const collatz = n => (n % 2 == 0) ? (n/2) : (3*n+1);
// collatz(8) --> 4
// collatz(5) --> 16
```
[⬆ back to top](#table-of-contents) [⬆ back to top](#table-of-contents)
### Compact ### Compact