javascript - 如何指定Map javascript的类型？

Question

我有两个Map():

private dictionaryMap = new Map();
private words = new Map<string, IDictItem>();

填充words后，我需要将此 map 添加到dictionaryMap中。

那么，如何为dictionaryMap指定类型？

我尝试过:

private dictionaryMap = new Map<string, Map<string, IDictItem>()>();

但似乎这是错误的。

Answer 1

您需要设置这些值或使用!来声明它们可以在开始时保持未初始化状态。

interface IDictItem {
  definition: string;
}

class Foo {
  private words = new Map<string, IDictItem>();
  private dictionaryMap: Map<string, Map<string, IDictItem>>;

  constructor(){
    this.words.set("hello", { definition: "word for greeting" });
    this.dictionaryMap = new Map([["key", this.words]])
  }
}

关于你的SubjectBehaviour包装。我缺乏一些关于您的需求的背景信息，但如果您需要的是订阅字典更改。那么这样的事情应该有帮助:

interface IDictItem {
  definition: string;
}

class Foo {
  private words = new Map<string, IDictItem>([["hello", { definition: "word for greeting" }]]);
  private dictionaryMap: Map<string, Map<string, IDictItem>>;
  // I was using jsfiddle, so you need to do an actual:
  // import { BehaviorSubject } from "rxjs";
  private dictionaryMapSubject = new rxjs.BehaviorSubject();
  private dictionaryKey = "key"


  constructor(){
    this.dictionaryMap = new Map([[this.dictionaryKey, this.words]]);
    this.dictionaryMapSubject.subscribe(console.log);
  }

  public publishDic(): void {
      const dic = this.dictionaryMap.get(this.dictionaryKey);
      this.dictionaryMapSubject.next(dic);
  }
}

const foo = new Foo();

foo.publishDic();