function transpose(a) {

    return Object.keys(a[0]).map(function(c) {

        return a.map(function(r) { return r[c]; });

    });

}

​

function secretArchivesLock(lock, actions) {

    actions = actions.split("");

    for (let k in actions){

        let action = actions[k];

        if(action == 'R' || action == 'L'){

            for(let row in lock){

                let rowArray = lock[row].split("");

                rowArray = rowArray.sort(function(a,b){

                    if(a =='.' && b != '.') return action == 'R' ? -1 : 1;

                    if(a !='.' && b == '.') return action == 'R'? 1 : -1;

                    return 0;

                })

                lock[row] = rowArray.join('');

            }

        }

        if(action == 'T' || action == 'B'){

          let lockCol = transpose(lock);

          for(let row in lockCol){

                let rowArray = lockCol[row];

                console.log("--")

                console.log(rowArray);

                rowArray = rowArray.sort(function(a,b){

                    if(a =='.' && b != '.') return action == 'T' ? 1 : -1;

                    if(a !='.' && b == '.') return action == 'T'? -1 : 1;

                    return 0;

                })

                lockCol[row] = rowArray.join('');

                console.log(lockCol[row]);

            }

            lock = transpose(lockCol) ;

        }

    }

}

​

lock = ["....",

        "BA..",

        ".C..",

        "...."];

actions = "T";

​

console.log(lock);

secretArchivesLock(lock, actions);

console.log(lock);

​

​

​

​

​