function deepClone(obj) {
  if (obj === null || typeof obj !== 'object') {
    return obj;
  }
  
  let clone = Array.isArray(obj) ? [] : {};
  
  for (let key in obj) {
    if (obj.hasOwnProperty(key)) {
      clone[key] = deepClone(obj[key]);
    }
  }
  
  return clone;
}

let originalObj = { name: 'John', age: 25 };
let clonedObj = deepClone(originalObj);
console.log(clonedObj);

let originalObj = { name: 'John', age: 25 };
let clonedObj = Object.assign({}, originalObj);
console.log(clonedObj);

let originalObj = { name: 'John', age: 25 };
let jsonString = JSON.stringify(originalObj);
let clonedObj = JSON.parse(jsonString);
console.log(clonedObj);

let sourceObj = { name: 'John', age: 25 };
let targetObj = {};
Object.assign(targetObj, sourceObj);
console.log(targetObj);