typescript 你如何在打字稿中声明一个对象数组？
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how do you declare an array of objects inside typescript?
提问by Red Baron
I would like to specify that function takes array of objects as parameter, but I don't have particular type defined for the object (sort of "anonymous type")
我想指定该函数将对象数组作为参数，但我没有为对象定义特定类型（类似于“匿名类型”）
bagTotal = (products) => {
// function does stuff
}
I understand I can do this:
我明白我可以这样做：
bagTotal = (products: any[]) => {
// function does stuff
}
but this is a bit more relaxed then what I want: to be strict with my typescript.
但这比我想要的要轻松一些：严格遵守我的打字稿。
productsis an array of same-looking objects like all objects have name, price, description.
products是一组外观相同的对象，就像所有对象都有名称、价格、描述。
how can I declare that?
我怎么能声明呢？
I want to do something like
我想做类似的事情
bagTotal = (products: [{name: string, price: number, description: string}]) => {
// function does stuff
}
but that's not right. How can I declare this?
但这是不对的。我该如何声明？
回答by Ingo Bürk
You're almost there, the placement of the brackets is just wrong:
你快到了，括号的位置是错误的：
{name: string, price: number, description: string}[]
The way you had it isn't entirely wrong, but it means something else: it means an array with exactly one item of this type.
您拥有它的方式并非完全错误，但它意味着其他含义：它意味着一个数组，其中仅包含一个此类项目。
I'd also recommend extracting it to an interface, it'd make the type reusable and the thing easier to read:
我还建议将它提取到一个界面，它会使类型可重用并且更易于阅读：
interface Product {
name: string;
price: number;
description: string;
}
const products: Product[];
回答by bautigaraventa
I think you must declare the class "Product" so you can declare a Product array like this:
我认为您必须声明“Product”类，以便您可以像这样声明一个 Product 数组：
products: Product[];
and pass it as a parameter like this:
并将其作为参数传递，如下所示：
bagTotal = (products: Product[]) => {
// function does stuff
}
To have the class you can do a new .ts file with this code:
要拥有该课程，您可以使用以下代码创建一个新的 .ts 文件：
export class Product {
name: String;
price: Number;
description: String;
}
I wish that helped!
我希望这有帮助！
Thank you.
谢谢你。
回答by Sockness_Rogers
If you are declaring an array of a specific object and want to specify type for variables in the objects, I would create a class for the object like this:
如果您要声明特定对象的数组并希望为对象中的变量指定类型，我会为该对象创建一个类，如下所示：
class Item(){
name: string;
description: string;
etc: any
constructor() {
this.name;
this.description;
this.etc;
}}
Then you can specify the array as an array of item objects:
然后，您可以将数组指定为项对象数组：
itemArray: Array<Item>;
