Snail

snail.js

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+// https://www.codewars.com/kata/snail
+
+// Description:
+// Given an n x n array, return the array elements arranged from outermost elements to the middle element, traveling clockwise.
+
+// array = [[1,2,3],
+//          [4,5,6],
+//          [7,8,9]]
+// snail(array) #=> [1,2,3,6,9,8,7,4,5]
+// For better understanding, please follow the numbers of the next array consecutively:
+
+// array = [[1,2,3],
+//          [8,9,4],
+//          [7,6,5]]
+// snail(array) #=> [1,2,3,4,5,6,7,8,9]
+
+snail = function(array) {
+  let arr = array;
+  let snailOutput = [];
+
+  while(arr.length > 0) {
+    // Take a first row amnd save it
+    const firstRow = arr[0];
+    snailOutput = snailOutput.concat(firstRow);
+    // Remove firstRow
+    arr.shift();
+    // Rotate 90 degrees matrix
+    if(arr[0]) {
+      arr = arr[0].map((col, i) =>
+        arr.map(row => row[row.length - 1 - i]));
+    }
+  }
+  return snailOutput;
+}