javascript - JS : conditionally adding adding in the middle of an array?

Question

如果我有一个数据数组，

const data = [
   {
     name: "dog",
     age: 11
   }, 
   {
     name: "cat",
     age: 21,
   }
]

如果条件为真，我想在其中添加一个对象:

const shouldAddNewAnimal = true;

const animal = {
   name: "tiger",
   age : 22,
}

如果没有 else 我怎么写呢？

const data = [
   {
     name: "dog",
     age: 11
   }, 
   foo ? animal : {};
   {
     name: "cat",
     age: 21,
   }
]

以上是我能想到的唯一编写方法，但如果条件不成立，我不想在其中插入一个空对象。

Answer 1

您可以使用数组展开，一个包含想要的对象，另一个是空的。

const
    shouldAddNewAnimal = true,
    animal = { name: "tiger", age: 22 },
    data = [
        { name: "dog", age: 11 },
        ...(shouldAddNewAnimal ? [animal] : []),
        { name: "cat", age: 21 }
    ];

console.log(data);

.as-console-wrapper { max-height: 100% !important; top: 0; }