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2624-snail-traversal/2624-snail-traversal.js

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+/**
+ * @param {number} rowsCount
+ * @param {number} colsCount
+ * @return {Array<Array<number>>}
+ */
+Array.prototype.snail = function(rowsCount, colsCount) {
+    n = this.length
+
+    if (n !== rowsCount * colsCount) return []
+
+    arr = Array(rowsCount)
+    for (let i = 0; i < rowsCount; ++i) arr[i] = Array(colsCount)
+
+    for (let i = 0; i < n; ++i) {
+        let col = parseInt(i / rowsCount)
+        let row = col % 2 === 0 ? i % rowsCount : rowsCount - (i % rowsCount) - 1
+        arr[row][col] = this[i]
+    }
+    return arr
+}
+
+/**
+ * const arr = [1,2,3,4];
+ * arr.snail(1,4); // [[1,2,3,4]]
+ */