best way to create greater than and less than in javascript code example

Example 1: js greater than or equal to

>= // greater than or equal 
<= // less than or equal
> // greater than
< // less than
== // equals
=== // strictly equals
!= // not equals
!== // stricly not equals

Example 2: greater than x but less than y javascript

let X = 4
let Y = 5
let Z = 8

if (Y < Z && Y > X) {
    console.log(`Y is less than Z but greater than X, or mathematically
	'X < Y < Z' or 'Z > Y > X'
	`);
}