在 TypeScript 中定义具有多种类型的数组
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Defining array with multiple types in TypeScript
提问by dk123
I have an array of the form: [ 1, "message" ].
我有一个以下形式的数组：[ 1, "message" ].
How would I define this in TypeScript?
我将如何在 TypeScript 中定义它？
回答by basarat
Defining array with multiple types in TypeScript
在 TypeScript 中定义具有多种类型的数组
Use a union type (string|number)[]demo:
使用联合类型(string|number)[]演示：
const foo: (string|number)[] = [ 1, "message" ];
I have an array of the form: [ 1, "message" ].
我有一个以下形式的数组：[ 1, "message" ]。
If you are sure that there are always only two elements [number, string]then you can declare it as a tuple:
如果您确定始终只有两个元素，[number, string]则可以将其声明为元组：
const foo: [number, string] = [ 1, "message" ];
回答by curpa
If you're treating it as a tuple (see section 3.3.3 of the language spec), then:
如果您将其视为元组（请参阅语言规范的第 3.3.3 节），则：
var t:[number, string] = [1, "message"]
or
或者
interface NumberStringTuple extends Array<string|number>{0:number; 1:string}
var t:NumberStringTuple = [1, "message"];
回答by Szamanm
My TS lint was complaining about other solutions, so the solution that was working for me was:
我的 TS lint 抱怨其他解决方案，所以对我有用的解决方案是：
item: Array<Type1 | Type2>
if there's only one type, it's fine to use:
如果只有一种类型，可以使用：
item: Type1[]
回答by j4ys0n
I've settled on the following format for typing arrays that can have items of multiple types.
我已经确定了以下格式来键入可以包含多种类型项目的数组。
Array<ItemType1 | ItemType2 | ItemType3>
Array<ItemType1 | ItemType2 | ItemType3>
This works well with testing and type guards. https://www.typescriptlang.org/docs/handbook/advanced-types.html#type-guards-and-differentiating-types
这适用于测试和类型保护。https://www.typescriptlang.org/docs/handbook/advanced-types.html#type-guards-and-differentiating-types
This format doesn't work well with testing or type guards:
这种格式不适用于测试或类型保护：
(ItemType1 | ItemType2 | ItemType3)[]
(ItemType1 | ItemType2 | ItemType3)[]
回答by DerKarim
Im using this version:
我正在使用这个版本：
exampleArr: Array<{ id: number, msg: string}> = [
{ id: 1, msg: 'message'},
{ id: 2, msg: 'message2'}
]
It is a little bit similar to the other suggestions but still easy and quite good to remember.
它与其他建议有点相似，但仍然很容易记住。
