How to copy an object in JavaScript?

Question

JavaScript

Good evening gentlemen.
Everyone knows that in JS, an object is passed by reference, not by value. Tell me, what are the options for copying an object?

Answer 1

var cloneOfA = JSON.parse(JSON.stringify(a));
or
Why should I google for you?
See also
stackoverflow.com/questions/728360/most-elegant-wa...

Answer 2

Via Object.assign()

const old = {mi: 1, ti: 2} // копируемый объект
const new = Object.asign({}, old);// присваиваем пустому объекту свойства old
new ! == old;// true

Answer 3

how about this option? I'm not sure if it covers all possible options, but the object is copied without saving the reference

const deepClone = (obj) => {
    let clone = {};
    for (let prop in obj) {
        if (typeof obj[prop] === 'object') {
            clone[prop] = deepClone(obj[prop]);
        } else {
            clone[prop] = obj[prop];
        }
    }

    return clone;
}