Merge pull request #115 from christianbender/master

collatz algorithm -- changed in 'js'

snippets/collatz-algorithm.md

@@ -0,0 +1,9 @@
+### 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
+```