How to use Type Assertion In Typescript
Another approach is to use type assertion to create arrays of multiple data types.
Example: This TypeScript code initializes `mixedArr` without specifying type but later asserts it to accept numbers, strings, or booleans using (number | string | boolean)[]. It then logs the array.
const mixedArr = [12, "GFG", true, "TypeScript"] as (number | string | boolean)[];
console.log(mixedArr);
Output:
[12, "GFG", true, "TypeScript"]
How to Create an Array of Multiple Data Types in TypeScript ?
In TypeScript, you can not directly define an array as you usually define it in JavaScript. You need to explicitly type the array with a particular data type whose values can be stored inside it. The type of an array can be specified using the colon syntax followed by the data type (:type). You can also create arrays that can store values of multiple data types using the Union type to explicitly type the array.
Table of Content
- Using Union Types
- Using Type Assertion