,

You will receive an array of strings containing the company name and employee's id. Add each employee to the given company. Keep in mind that a company cannot have two employees with the same id.

Print the company name and each employee's id in the following format:

{companyName}

-- {id1}

-- {id2}

-- {idN}

function solve(input) {
    let res = [];

    input.map(x => x.split(" -> ")) // " -> " !!!
        // .map(x => res.push({ name: x[0], number: x[1] }));
        .map(x => {
            const [company, number] = [...x];

            // create a new object, filter by company name and include only unique employee numbers
        });

    res.sort((a, b) => { return a.name[0].localeCompare(b.name[0]) })
        // foreach would be a better option
        .foreach(x => {
            // log only company name once and numbers thereafter
        });
}

res.sort((a, b) => { return a.name[0].localeCompare(b.name)})

res.sort((a, b) => { return a.name[0].localeCompare(b.name[0])})