[basic] deepClone

lib/deepCloneObj.ts

@@ -0,0 +1,40 @@
+// JSON.parse(JSON.stringify(obj))
+// structuredClone(obj)
+// _.cloneDeep(obj);
+
+const obj = {
+  name: "Vasily",
+  addres: {
+    citi: "Saint",
+    street: "Vilnizki",
+  },
+};
+
+const obj2 = Object.assign({}, obj);
+const obj3 = structuredClone(obj);
+
+// console.log("shallow: ", obj.addres === obj2.addres);
+// console.log("deepclone: ", obj.addres === obj3.addres);
+//
+// recursive implementation cloneDeep
+
+function deepClone(value: any) {
+  if (typeof value !== "object" || value === null) {
+    return value;
+  }
+
+  if (Array.isArray(value)) {
+    return value.map((item) => deepClone(item));
+  }
+
+  const objEntries = Object.entries(value).map(([key, value]) => [
+    key,
+    deepClone(value),
+  ]);
+
+  return Object.fromEntries(objEntries);
+}
+
+const obj4 = deepClone(obj);
+
+console.log("deepclone(): ", obj.addres === obj4.addres);