password reset - final exam - fundamentals

function password(input) {
    let passwords = input.shift();
    //console.log(passwords);
    let line = input.shift();
    while (line != "Done") {
        let [command, firstArgument, secondArgument] = line.split(" ");
        switch (command) {
            case "TakeOdd":
                let newPassword = "";
                for (let i = 0; i < passwords.length; i++) {
                    if (i % 2 !== 0) {
                        newPassword += passwords[i];
                    }
                }
                passwords = newPassword;
                console.log(passwords);
                break;
            case "Cut":
                let index = Number(firstArgument);
                let length = Number(secondArgument);
                let first = passwords.substring(0, index);
                let second = passwords.substring(index + length);
                passwords = first + second;
                console.log(passwords);
                break;
            case "Substitute":
                let elementToReplace = firstArgument;
                let elSubstitute = secondArgument;
                if (passwords.includes(elementToReplace) === 0) {
                    console.log(`Nothing to replace!`);
                   break;
                } else {
                    passwords = passwords.replace(elementToReplace, elSubstitute);
                    console.log(passwords);
                }
                break;
        }
        line = input.shift();
    }
    console.log(`Your password is: ${passwords}`);
}

password((["Siiceercaroetavm!:?:ahsott.:i:nstupmomceqr",
    "TakeOdd",
    "Cut 15 3",
    "Substitute :: -",
    "Substitute | ^",
    "Done"])
);