Reversing Fun

reversing-fun/index.bf

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+>
+,[>,]
+
+<[->+>+<<]> >[-<<+>>]< copy here from left cell
+
+[[-] make loop if copied is nonzero:
+ <[
+  .[-] print & remove right
+  <[<] move left edge
+  >[.[-]] print & remove left if exist
+  >[>] move right edge
+ ]
+ <[->+>+<<]> >[-<<+>>]< copy here from left cell
+]
+
+<[<]

reversing-fun/index.js

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+// https://www.codewars.com/kata/reversing-fun/javascript
+
+function flipNumber(n) {
+  let cnt = 0;
+  const arr = [...n];
+  const res = [];
+  while (1) {
+    let c = arr[++cnt % 2 ? 'pop' : 'shift']();
+    if (!c) return res.join``;
+    res.push(c);
+  }
+}