How to determine from 2 types either 1 or 2

Question

I am new to typescript.

I have 2 type.

type Point = {
    x: number;
    y: number;
};

type Label = {
    name: string;
};

I have Variable Duko.

let Duko: ? = {...};

How to say that Duko is equal to Label type or Point.

https://www.typescriptlang.org/docs/handbook/advanced-types.html — jonrsharpe, Aug 23 '19 at 12:21
Are you asking specifically only how to declare the variable as a `Point` or a `Label`, or are you also asking how to tell which one it is later on? — crashmstr, Aug 23 '19 at 12:29
@crashmstr [Look what i want](https://codesandbox.io/s/typescript-91lle) — , Aug 23 '19 at 12:48
Please edit the question to clarify that you want `Duko` to be `Label` or `Point` *but not both*. — jcalz, Aug 23 '19 at 16:46

score 2 · Answer 1 · answered Aug 23 '19 at 12:22

2

Use an union type:

A union type describes a value that can be one of several types. We use the vertical bar (|) to separate each type, so number | string | boolean is the type of a value that can be a number, a string, or a boolean.

Therefore:

let Duko: Point | Label = {...};

Also an interesting read: Typescript: Interfaces vs Types

answered Aug 23 '19 at 12:22

pzaenger

11,381
3
45
46

1

your example is not what i want. [Look what i want](https://codesandbox.io/s/typescript-91lle) – Aug 23 '19 at 12:47

How to determine from 2 types either 1 or 2

1 Answers1