how to check less than or equal to in javascript code example

Example 1: javascript greater than or equal to

The greater than or equal operator ( >= ) returns true if the left operand is greater than or equal to the right operand, and false otherwise.

Example 2: javascript less than but greater than

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'
	`);
}