react generics in typescript

index.ts
// Generic function
function identity<T>(arg: T): T {
    return arg;
}

let result = identity<string>("hello"); // result will be string type

// Generic class
class DataContainer<T> {
    private data: T;

    constructor(initData: T) {
        this.data = initData;
    }

    getData(): T {
        return this.data;
    }
}

let container = new DataContainer<number>(10); // container is of type number
let data = container.getData(); // data will be of type number
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