name: string; constructor(name: string) { this.name = name } You don't have to do this in TypeScript either, you can just do constructor(p

name: string; constructor(name: string) { this.name = name } You don't have to do this in TypeScript either, you can just do constructor(public name: string) { } Also, the "Empty collections" section doesn't do the same thing, the collections you created in Kotlin are immutable. And the TypeScript ones have the value `undefined` (unfortunate that strictNullChecks doesn't catch things like that https://github.com/Microsoft/TypeScript/issues/8476 https://github.com/Microsoft/TypeScript/issues/8476). And for some nitpicking, please be consistent with your semicolons, either use them or don't use them, but don't mix it randomly like that.