world tour

//01. World Tour
function solve(input) {

    let tour = input.shift();
    let line = input.shift();

    while (line !== 'Travel') {

        let [command, ...rest] = line.split(':');
        command = command.trim()

        if (command === "Add Stop") {
            let index = Number(rest[0]);
            let string = rest[1];
            if (index >= 0 && index <= tour.length) {
                tour = tour.split('');
                tour.splice(index, 0, string);
                tour = tour.join('');
            }
        } else if (command === "Remove Stop") {
            let strIndex = Number(rest[0]);
            let endIndex = Number(rest[1]);
            if (strIndex >= 0 && strIndex < tour.length &&
                endIndex >= 0 && endIndex < tour.length) {
                tour = tour.split('');
                tour.splice(strIndex, endIndex - strIndex + 1);
                tour = tour.join('');
            }
        } else if (command === "Switch") {
            let oldString = rest[0];
            let newString = rest[1];
            let rgx = new RegExp(oldString, 'g');
            tour = tour.replace(rgx, newString);
        }
        console.log(tour);
        line = input.shift();
    }
    console.log(`Ready for world tour! Planned stops: ${tour}`)
}
solve(['Hawai::Cyprys-Greece','Add Stop:7:Rome','Remove Stop:11:16','Switch:Hawai:Bulgaria','Travel'])