Question

在以下数组中，我想将名称替换为大写。我尝试了map，但是创建了一个新的名称数组。还有其他方法可以做到这一点。

var newArr = [ {name: "ash", age: 10, address: "newhomw"},
               {name: "Jo", age: 20, address: "gloom"}
             ]

Answer 1

用于每个人

newArr.forEach(item => item.name = item.name.toUpperCase())

Answer 2

如果需要新数组，请使用地图
如果可以修改现有数组，请使用forEach

大写：

let arr = [ 
  {name: "ash", age: 10, address: "newhomw"},
  {name: "jo", age: 20, address: "gloom"}
];
             
arr.forEach(item => { let name = item.name; item.name = name.slice(0,1).toUpperCase()+name.slice(1)});

console.log(arr);

大写：

let arr = [ 
  {name: "ash", age: 10, address: "newhomw"},
  {name: "jo", age: 20, address: "gloom"}
];
             
arr.forEach(item => item.name = item.name.toUpperCase());

console.log(arr);

Answer 3

使用Array.forEach：

newArr.forEach( (item, i, self) => self[i]["name"] = item.name.toUpperCase());

使用Array.map：

newArr = newArr.map(item => Object.assign({}, item, {name: item.name.toUpperCase()}));

如何替换对象数组中的值

3 个答案: