A simple command line application behaving like a USSD application

ussd.js

// import the readline module to get user input
readline = require('node:readline')

class BankUSSD {    
    main(){
        
        // Define the variable that will be used to get user input 
        const userInput = readline.createInterface({
            input: process.stdin,
            output: process.stdout,
        });

        console.log("Access Bank")
        console.log("1>Check balance")
        console.log("2>Transfer")
        console.log("3>Airtime")
        console.log("4>Buy Data")
        
        console.log("\n\n")
        
        // Prompt user to select their option
        userInput.question(`Please an option:`, option => {
            this.handleInput(option);
            input.close();
        });
    }
    
    // method to handle user input
    handleInput(option){
        if (option == 1){
            console.log("You selected option 1")
        } else if (option == 2) {
            console.log("You selected option 2")
        } else if (option == 3) {
            console.log("You selected option 3")
        } else if (option == 4) {
            console.log("You selected option 4")
        } else {
            console.log("Unknown option")
        }
    }
}

// Create an instance of the BankUSSD class
let ussd = new BankUSSD()
// Call the main method
ussd.main()