Currently delving into TypeScript, I am attempting to generate a collection in a manner akin to the following Java example:
HashMap<String, List<String>> hashMap = new HashMap<String,List<String>>();
Struggling to locate any relevant examples. Is it feasible to replicate this functionality in Typescript? Are there comparable alternatives available?
HashMap ensures that keys are unique. You can easily assign an array to a key using a simple object:
let hash = {};
hash["furry"] = [];
hash["furry"].push({ age: 4, name: "fluffy" });
console.log(hash)Alternatively, you can utilize Record<Keys, Type>. According to the documentation:
Generates an object type with specified property keys as Keys and corresponding property values as Type. This feature allows mapping properties of one type to another.
interface DogInfo {
age: number;
name: string;
}
type DogBreed = "husky" | "poodle" | "corgi";
const dogs: Record<DogBreed, DogInfo[]> = {
husky: [{ age: 5, name: "shadow" }],
poodle: [{ age: 2, name: "bella" }],
corgi: [{ age: 10, name: "rover" }],
};
UPDATE:
To add an item to Record<Keys, Type>, follow this approach:
dogs["husky"].push({ age: 8, name: "max" });
To retrieve items from Record<Keys, Type>, use this method:
const huskies: DogInfo[] = dogs["husky"];
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