misc: restructure contents

experimental/utilities/javascript/matrixTraverse.js

@@ -0,0 +1,30 @@
+function traverse(matrix) {
+  const DIRECTIONS = [[0, 1], [0, -1], [1, 0], [-1, 0]];
+  const rows = matrix.length;
+  const cols = matrix[0].length;
+  const visited = matrix.map(row => Array(row.length).fill(false));
+  function dfs(i, j) {
+    if (visited[i][j]) {
+      return;
+    }
+    visited[i][j] = true;
+    DIRECTIONS.forEach(dir => {
+      const row = i + dir[0],
+        col = j + dir[1];
+      // Boundary check.
+      if (row < 0 || row >= rows || col < 0 || col >= cols) {
+        return;
+      }
+      // Valid neighbor check.
+      if (matrix[row][col] !== 1) {
+        return;
+      }
+      dfs(row, col);
+    });
+  }
+  for (let i = 0; i < rows; i++) {
+    for (let j = 0; j < cols; j++) {
+      dfs(i, j);
+    }
+  }
+}