JavaScript has special data structures called objects (in other programming languages they are called associative arrays or hashes).
Objects are created using braces { },
inside which the elements of this object are
written in the format key: value.
Let's create an empty object:
let obj = {};
And now let's create an object with data:
let obj = {1: 'a', 2: 'b', 3: 'c'};
Retrieve an element of the object by its key:
console.log(obj[1]); // shows 'a'
Create an object with keys from 1
to 7, containing the names of the
days of the week as values. Display all
of its elements.