Mirrored Exponential Chunks

mirrored-exponential-chunks/index.js

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+// https://www.codewars.com/kata/5852d0d463adbd39670000a1/javascript
+
+function mirroredExponentialChunks(arr) {
+  const len = arr.length;
+  const left = arr.slice(0, len/2);
+  const right = arr.slice((len+1)/2);
+  const res = len % 2 === 1 ? [[arr[(len-1)/2]]] : [];
+  
+  for (let i = 1; left.length; ++i) {
+    res.unshift(left.splice(-(2**i)));
+  }
+  for (let i = 1; right.length; ++i) {
+    res.push(right.splice(0, 2**i));
+  }
+  return res;
+}