如果条件为真，如何查找和替换值数组项

Question

我有一个如下所示的数组

const arr = [
  {
    id: "first",
    val: 'ganguly',
  },
  {
    id: "third",
    val: 'sachin',
  },
 ]
 
 const selectedVaue ='dhoni';

如果 id 与 'third' 匹配，则将值替换为特定键

const list = arr.filter(data => data.id === 'third');
     if (list.length > 0 ) {
         // code 
     }

预期结果如下：

    const arr = [
  {
    id: "first",
    val: 'ganguly',
  },
  {
    id: "third",
    val: 'dhoni',
  },
 ]

Answer 1

您可以使用 Array.prototype.map 并用 id "third" 替换的值创建一个新数组。

const arr = [
  { id: "first", val: "ganguly" },
  { id: "third", val: "sachin" },
];

const selectedValue = "dhoni";

const res = arr.map((a) =>
  a.id === "third" ? { ...a, val: selectedValue } : a
);

console.log(res);

或者你可以使用 Array.prototype.forEach 如果你想替换对象。

const arr = [
  { id: "first", val: "ganguly" },
  { id: "third", val: "sachin" },
];

const selectedValue = "dhoni";

arr.forEach((a, i) => {
  if (a.id === "third") {
    arr[i] = { ...a, val: selectedValue };
  }
});

console.log(arr);

如果条件为真，如何查找和替换值数组项

How to find and replace the value array item if condtion is true

javascript

filter

typescript