secretArchivesLock

secretArchivesLock.js

function secretArchivesLock(lock, actions) {
    const getCol = (lock, index) => {
        return lock.map(r => r.charAt(index)).filter((x) => x !== '.')
    }
    const getRows = (lock) => lock.map((v) => v.split("").filter((x) => x !== '.'));
    const getCols = (lock) => Array.apply(null, Array(lock[0].length)).map((_, i) => getCol(lock, i))
    const fillLeft = (vector, length) =>
        Array.apply(null, Array(length - vector.length)).map(() => '.').concat(vector);
    const fillRight = (vector, length) =>
        vector.concat(Array.apply(null, Array(length - vector.length)).map(() => '.'));
    const combineRows = (vectors) => vectors.map((v) => v.join(""));
    const combineCols = (vectors) => vectors.reduce((prev, cur) => {
        cur.map((c, i) => prev[i] += c);
        return prev;
    }, Array.apply(null, Array(vectors[0].length)).map(() => ""));
    const acts = {
        L: (lock) =>
            combineRows(getRows(lock).map((v) => fillRight(v, lock[0].length))),
        R: (lock) =>
            combineRows(getRows(lock).map((v) => fillLeft(v, lock[0].length))),
        U: (lock) =>
            combineCols(getCols(lock).map((v) => fillRight(v, lock.length))),
        D: (lock) =>
            combineCols(getCols(lock).map((v) => fillLeft(v, lock.length)))
    };
    return actions.split("").reduce((prev, cur) => acts[cur](prev) , lock);
}