键值对在 Typescript 中可用吗？
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Is key-value pair available in Typescript?
提问by CodeHunter
Is key,value pair available in typescript? If yes how to do that. Can anyone provide sample example links.
键值对在打字稿中可用吗？如果是，该怎么做。任何人都可以提供示例示例链接。
回答by basarat
Is key-value pair available in Typescript?
键值对在 Typescript 中可用吗？
Yes. Called an index signature:
是的。称为索引签名：
interface Foo {
[key: string]: Bar;
}
let foo:Foo = {};
Here keys are stringand values are Bar.
这里的键是string，值是Bar。
More
更多的
You can use an es6 Mapfor proper dictionaries, polyfilled by core-js.
您可以将 es6Map用于适当的字典，由core-js.
回答by Jaime
The simplest way would be something like:
最简单的方法是这样的：
var indexedArray: {[key: string]: number}
Usage:
用法：
var indexedArray: {[key: string]: number} = {
foo: 2118,
bar: 2118
}
indexedArray['foo'] = 2118;
indexedArray.foo= 2118;
let foo = indexedArray['myKey'];
let bar = indexedArray.myKey;
回答by Hyman Miller
Is key-value pair available in Typescript?
键值对在 Typescript 中可用吗？
If you think of a C# KeyValuePair<string, string>: No, but you can easily define one yourself:
如果您想到 C# KeyValuePair<string, string>：不，但您可以轻松地自己定义一个：
interface KeyValuePair {
key: string;
value: string;
}
Usage:
用法：
let foo: KeyValuePair = { key: "k", value: "val" };
回答by peter70
Not for the questioner, but for all others, which are interested: See: How to define Typescript Map of key value pair. where key is a number and value is an array of objects
不是针对提问者，而是针对所有其他感兴趣的人：请参阅：如何定义键值对的 Typescript Map。其中键是一个数字，值是一个对象数组
The solution is therefore:
因此，解决方案是：
let yourVar: Map<YourKeyType, YourValueType>;
// now you can use it:
yourVar = new Map<YourKeyType, YourValueType>();
yourVar[YourKeyType] = <YourValueType> yourValue;
Cheers!
干杯!
回答by Hyman Miller
回答by carolopolo
an example of a key value pair is:
键值对的一个例子是：
[key: string]: string
[key: string]: string
you can put anything as the value - if you have programmatically populated values whose types vary, you could put:
您可以将任何内容作为值 - 如果您有以编程方式填充的类型不同的值，您可以输入：
[key: string]: any
[key: string]: any
though proceed at your own discretion with any:)
尽管您可以自行决定继续any:)
回答by magikMaker
You can also consider using Record, like this:
你也可以考虑使用Record，像这样：
const someArray: Record<string, string>[] = [
{'first': 'one'},
{'second': 'two'}
];
Or write something like this:
或者这样写：
const someArray: {key: string, value: string}[] = [
{key: 'first', value: 'one'},
{key: 'second', value: 'two'}
];
回答by HgMs
class Pair<T1, T2> {
private key: T1;
private value: T2;
constructor(key: T1, value: T2) {
this.key = key;
this.value = value;
}
getKey() {
return this.key;
}
getValue() {
return this.value;
}
}
const myPair = new Pair<string, number>('test', 123);
console.log(myPair.getKey(), myPair.getValue());
