HashMap with List as a value in Typescript-CodePudding

I am learning TypeScript and am trying to create a collection similar to the following in Java

HashMap<String, List<String>> hashMap = new HashMap<String,List<String>>();

I am unable to find any examples . Is it possible to do this in Typescript? Is there something similar to this?

CodePudding user response：

HashMap contains only unique keys. So you can use simple object and assign array to key:

let hash = {};
hash["bobtail"] = [];
hash["bobtail"].push({ age: 10, name: "miffy" });
console.log(hash)

Or try to use Record<Keys, Type>. As docs says:

Constructs an object type whose property keys are Keys and whose property values are Type. This utility can be used to map the properties of a type to another type.

interface CatInfo {
  age: number;
  name: string;
}
 
type CatBreed = "bobtail" | "birman" | "maine";
 
const cats: Record<CatBreed, CatInfo[]> = {
  bobtail: [{ age: 10, name: "miffy" }],
  birman: [{ age: 5, name: "moorzik" }],
  maine: [{ age: 16, name: "mordred" }],
};