clone.js

// to run this file, do: node clone.js

const array1 = [1, 2, 3];
const shallowCloneArray = [...array1];
console.log(array1);
console.log(shallowCloneArray);
console.log(array1 === array1, "should be true");
console.log(array1 === shallowCloneArray, "should be false");

const object1 = { a: 1, b: 2, c: 3 };
const shallowCloneObject = Object.assign({}, object1, { extraData: "online" });
console.log(object1);
console.log(shallowCloneObject);
console.log(object1 === object1, "should be true");
console.log(object1 === shallowCloneObject, "should be false");

// // new, now available natively in modern browsers:
// const obj = { a: 1, b: 2, circularRef: null };
// obj.circularRef = obj;
// const deepClone = structuredClone(obj);