Musical practice in JS

practice.js

// ************************************
// Marc on how to practice effectively
// ************************************

import Universe from 'universe';
import Player from 'player';

// teaching and practicing methods, implement .teach() and .helpWithPractice()
import flowkey from 'flowkey';
import PianoTeacher from 'piano-teacher';

const universe = new Universe(); // keep defaults
const person = new Player({ skillfulness: 100, iq: 131, humor: 80, taste: 'good' }); // typical average piano player

const teacher = new PianoTeacher();

universe.onEvery('day', () =>
    practice({
        brain: person.brain,
        body: person.body,
    }),
);

function practice({ brain, body }) {
    //* preparation
    const important = brain.askQuestion('Was ist in dieser Übesession wirklich neu?');

    // FIXME: This should not be needed, brain should be motivated all the time if possible.
    // Maybe implement in Player class in onWakeUp eventHandler?
    brain.becomeMotivated();

    const goals = brain
        .getOrCreateGoals()
        .filter(goal => goal.isPositiveGoal) // e. g. "Play song at 100 BPM" instead of "Don't be too slow"
        .reduce((finalGoals, goal) => {
            if (goalIsTooBroad(goal)) {
                // e. g. "Play song at 100 BPM" instead of "Improve on song"
                const concreteGoals = reifyGoal(goal); // simplify
                return [...finalGoals, ...reifyGoals];
            } else {
                return [...finalGoals, goal];
            }
        }, []);

    if (goalsContradictEachOther(goals)) {
        // e. g. contradicting goals: "Become boulding chamption" <=> "Improve articulation on piano"
        filterContradictingGoals(goals);
    }

    createOrIterateOnLongtermGoals();

    const practicingHabits = brain.habits.practice;

    // e. g. playing the same exercise every time even though you don't need it anymore
    filterHabitsThatAreNoLongerNeededButConsumeALotOfTime(practicingHabits);

    //* actual practicing
    doPreparationExercises(); // play scales and so on

    for (goal of goals) {
        practiceForIndividualGoal({ goal, method: flowkey }); // flowkey is a good default for the beginning
        assessWhetherGoalWasReached(goal); // e.g. make recordings etc.
    }

    playOldPieces();
    improviseAndHaveSomeFun();

    //* follow-up
    const answer = brain.askQuestion('Ziele erreicht? Was mache ich nächstes mal anders?'); // whatever
    body.writeOnPaper(answer);
}

function practiceForIndividualGoal({ goal, method }) {
    while (!archievedGoal(goal)) {
        practiceForGoal(goal, method); // dependency injection for the pros

        if (hasPracticedALot()) {
            makeSmallBreak();
        }

        if (brain.isSatisfiedWithPracticeForGoal(goal)) {
            goal.archieve();
        }
    }
}

function doPreparationExercises() {
    playScales();
    practiceSightReading();
    doFingerExercises();
    // ...
}