generic type with limited possibilities typescript code example

Example 1: typescript generic class

class Person<T, U, C> {
  name: T
  age: U
  hobby: C[]

  constructor(name: T, age: U, hobby: C[]) {
    this.name = name
    this.age = age
    this.hobby = hobby
  }
}

const output = new Person<string, number, string>('john doe', 23, ['swimming', 'traveling', 'badminton'])
console.log(output)

Example 2: how to make a generic variable in javascript

var x = 1;
var y = 1;
if (x == y) {
  x = x + 1
}