let products = new Map();

products.set('Arroz', 7.10);
products.set('Feijão', 2.30);
products.set('Macarrão', 4.70);
products.set('Refrigerante', 3.00);

function hasProduct(products, wishedProduct){
  return products.has(wishedProduct);
}

hasProduct(products, 'Macarrão');
hasProduct(products, 'Cimento');