JS30 Challenge Day 14 - Copy and Reference

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1.Copy
let age=100;
let age2=age;
age2=200;
age will not change to 200

If age is changed, age2 will not change

2.Reference
players and teams are arrays
const team = players;
team[3]="AK";
Here, players[3] also changes to AK

If players is changed, team also changes. So this changes the values both ways.

3.Copy
const team2=players.slice();
changing team2 will not affect players

Changing either one won't change the other
Works for [...players] and Array.from() the same

4.Reference
Just like arrays, objects also pass by reference
To avoid that, we use Object.assign();

const age3=Object.assign({},person,{number:99});
first arg is an empty object, second is the object to fold in, third is the values we want to additionally fold in.
Difference between slice and splice in Arrays