Secret Chat JS Fundamentals

function secretChat(arr) {
    let message = arr.shift().split(' ').toString();

    for (let line of arr) {
        let tokens = line.split(':|:')
        let command = tokens[0];
        let parameters = tokens.slice(1);

        if (command === "InsertSpace") {
            message = message.substring(0, parameters[0]) + ' ' + message.substring(parameters[0]);
            console.log(message);
        } else if (command === "Reverse") {
            let substring = parameters[0];
            if (message.includes(substring)) {
                message = message.replace(substring, '');
                let reversed = substring.split('').reverse().join('');
                message += reversed;
                console.log(message);
            } else {
                console.log("error");
            }
        } else if (command === "ChangeAll") {
                while (message.includes(parameters[0])) {
                    message = message.replace(parameters[0], parameters[1]);
                }
            console.log(message);
        } else if (command === "Reveal") {
            console.log(`You have a new text message: ${message}`);
            return;
        }
    }
}