const products = [{name :"a", quantity:5}, {name :"c", quantity:3} ] make a function to find by name and increment the quantity. Must be imutable. Must return the updated products array.

function findAndUpdate(products, name){
  return products.map(function(product){
    if (product.name === name){
      product.quantity += 1;
    }
    return product;
  });
}