simple simon for the command line

simon.js

function sample(array){
    return array[Math.floor(Math.random() * array.length)];
}

/**
 * colorize and individual color functions adapted from
 * https://kpumuk.info/ruby-on-rails/colorizing-console-ruby-script-output/
 */
function colorize(text, code){
    return '\033[' + code + 'm' + text + '\033[0m';
}

function red(text){
    return colorize(text, 31);
}

function green(text){
    return colorize(text, 32);
}

function yellow(text){
    return colorize(text, 33);
}

function blue(text){
    return colorize(text, 34);
}

function showSequence(sequence, cb){
    sequence.forEach(function(color, index){
        setTimeout( function(){
            showColor(color);
            setTimeout( function(){
                process.stdout.write('\r                     ');
            }, 800);
        }, 1000 * index);
    });

    setTimeout( function(){
        process.stdout.write('\r');
        cb();
    }, 1000 * (sequence.length + 1) - 800);
}

function showColor(color){
    process.stdout.write('\r' + color.func('===' + color.name + '==='));
}

/**
 * gets user input from the command line
 * 
 * @param  {String}   prompt [message to display prompting the user]
 * @param  {Function} cb     [callback function, will be passed the user input
 *                            as a string]
 */
function getInput(prompt, cb){
    if (typeof prompt !== 'string' || typeof cb !== 'function') {
        throw 'getInput expects a string \'prompt\' and a function \'cb\'';
    }

    process.stdout.write(prompt);
    process.stdin.resume();
    process.stdin.once('data', function(data){
        cb(data.toString().trim());
    });
}

/**
 * grabs the first character of every word the user entered and converts it to 
 * lowercase, checks to see if that string is equal to the same transformation
 * applied to the simon sequence of color names
 */
function checkUserInput(userSequence, simonSequence){
    return userSequence.trim().split(' ').map(function(color){
        return color.substr(0, 1).toLowerCase();
    }).join('') === simonSequence.map(function(color){
        return color.name.substr(0, 1).toLowerCase();
    }).join('');
}

function getNewColor(){
    return sample([
        {name: 'red', func: red},
        {name: 'green', func: green},
        {name: 'yellow', func: yellow},
        {name: 'blue', func: blue}
    ]);
}

function startRound(simonSequence){

    console.log('\033cScore: ' + simonSequence.length);

    simonSequence.push(getNewColor());

    showSequence(simonSequence, function(){
        getInput('enter the sequence separated by spaces\n> ', function(input){
            if (checkUserInput(input, simonSequence)){
                startRound(simonSequence);
            } else {
                endGame(simonSequence);
            }
        });
    });
    
}

function endGame(simonSequence){
    console.log('Game Over!');
    console.log('Simon Sequence: ');

    process.stdout.write(simonSequence.map(function(color){
        return color.func(color.name);
    }).join(' | '));
    
    console.log('');
    console.log('Your Score: ' + (simonSequence.length - 1));
    process.exit();
}

console.log('Simple Simon!');

startRound([]);