https://leetcode.com/explore/featured/card/30-day-leetcoding-challenge/529/week-2/3299/

performStringShift.js

var stringShift = function(s, shift) {
    
    const net = shift.reduce((acc, [direction, magnitude]) => {
        return acc + (direction === 1 ? magnitude : -magnitude);
    }, 0) % s.length;
    
    
    if(net === 0) return s;
    
    if(net > 0){
        const [left, right] = [s.slice(0, s.length - net), s.slice(s.length - net)];
        return right + left;
    }else{
        const [left, right] = [s.slice(0, Math.abs(net)), s.slice(Math.abs(net))];
        return right + left;
    }
};