Catalogue

function solve(arr) {
  let catalogue = {};

  for (let info of arr) {
    info = info.split(' : ');
    const product = info[0];
    const price = Number(info[1]);
    if (!(Object.keys(catalogue).includes(product[0]))) {
      catalogue[product[0]] = {};
    }
    catalogue[product[0]][product] = price;
  }

  for (const letter of Object.keys(catalogue).sort((a, b) => a.localeCompare(b, undefined, {sensitivity: 'base'}))) {
    console.log(`${letter}`);
    for (const product of Object.keys(catalogue[letter]).sort((a, b) => a.localeCompare(b, undefined, {sensitivity: 'base'}))) {
      console.log(`  ${product}: ${catalogue[letter][product]}`);
    }
  }
}