website: move into monorepo

apps/website/experimental/utilities/javascript/matrixClone.js

@@ -0,0 +1,61 @@
+function matrixClone(matrix, defaultValue) {
+  return matrix.map((row) => {
+    return defaultValue === undefined
+      ? row.slice(0)
+      : Array(row.length).fill(defaultValue);
+  });
+}
+
+const deepEqual = require('./deepEqual');
+
+// Test clone.
+const a = [
+  [1, 2],
+  [1, 4],
+];
+console.log(
+  deepEqual(matrixClone(a), [
+    [1, 2],
+    [1, 4],
+  ]),
+);
+a[0][0] = 4;
+console.log(
+  deepEqual(matrixClone(a), [
+    [1, 2],
+    [1, 4],
+  ]) === false,
+);
+console.log(deepEqual(matrixClone([[1]]), [[1]]));
+
+// Test clone with default value.
+console.log(
+  deepEqual(
+    matrixClone(
+      [
+        [1, 2],
+        [1, 4],
+      ],
+      1,
+    ),
+    [
+      [1, 1],
+      [1, 1],
+    ],
+  ),
+);
+console.log(
+  deepEqual(
+    matrixClone(
+      [
+        [1, 2],
+        [1, 4],
+      ],
+      null,
+    ),
+    [
+      [null, null],
+      [null, null],
+    ],
+  ),
+);