PROGRAMMING
Php
Primitives vs. Objects
One of the fundamental differences of objects vs primitives. Objects are stored and copied by reference.Primitives
We have two independent variables, each one is storing the string "Hello!".
let message = "Hello!";
let phrase = message;
Objects
With objects we have two variables, each one with the reference to the same object. Here, the object is stored somewhere in memory, and the user has a “reference†to it. When an object variable is copied – the reference is copied.
let user = { name: 'John' };
let admin = user;
admin.name = 'Pete';
console.log(user.name); // Pete - from the user reference
Not equal
Here two independent objects are not equal, even though both are empty.
let a = {};
let b = {}; // two independent objects
alert( a == b ); // false
Make a duplicate of the user (no reference). Hint: copy user properties
let user = {
name: "John",
age: 30
};
let clone = {}; // new empty object
// your code here
// your code END
clone.name = "Pete"; // changed the data
console.log(user.name); // John - from the original object
➥ Questions
