04. Store Catalogue - JS-Advanced / JS-Fundamentals

function solve(arr) {
    arr.sort();

    let lastLetter;
    while(arr.length!=0){
        if(arr[0][0]!=lastLetter){
            lastLetter = arr[0][0];
            console.log(lastLetter);
        }
        let [product, price]= arr.shift().split(' : ');
        console.log(`  ${product}: ${price}`);
    }
}