js技巧之使用展开运算符合并对象和对象数组

// merging objects const product = { name: 'Milk', packaging: 'Plastic', price: '5$' } const manufacturer = { name: 'Company Name', address: 'The Company Address' }  const productManufacturer = { ...product, ...manufacturer }; console.log(productManufacturer);  // outputs { name: "Company Name", packaging: "Plastic", price: "5$", address: "The Company Address" }  // merging an array of objects into one const cities = [     { name: 'Paris', visited: 'no' },     { name: 'Lyon', visited: 'no' },     { name: 'Marseille', visited: 'yes' },     { name: 'Rome', visited: 'yes' },     { name: 'Milan', visited: 'no' },     { name: 'Palermo', visited: 'yes' },     { name: 'Genoa', visited: 'yes' },     { name: 'Berlin', visited: 'no' },     { name: 'Hamburg', visited: 'yes' },     { name: 'New York', visited: 'yes' } ];  const result = cities.reduce((accumulator, item) => {   return {     ...accumulator,     [item.name]: item.visited   } }, {});  console.log(result); /* outputs Berlin: "no" Genoa: "yes" Hamburg: "yes" Lyon: "no" Marseille: "yes" Milan: "no" New York: "yes" Palermo: "yes" Paris: "no" Rome: "yes" */ 

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