0838-push-dominoes.ts

function pushDominoes(dominoes: string): string {
    let res = dominoes.split('');
    while (true) {
        let temp = res.slice();
        let changed = false;
        for (let i = 0; i < res.length; i++) {
            if (res[i + 1] === 'L' && res[i - 1] === 'R' && res[i] === '.') {
                continue;
            } else if (res[i + 1] === 'L' && res[i] === '.') {
                temp[i] = 'L';
                changed = true;
            } else if (res[i - 1] === 'R' && res[i] === '.') {
                temp[i] = 'R';
                changed = true;
            }
        }
        res = temp;
        if (!changed) break;
    }

    return res.join('');
}