Hands-On Full Stack Web Development with Angular 6 and Laravel 5

Creating a tuple

A tuple is like an organized typed array. Let's create one to see how it works:

1. Inside the chapter-02 folder, create a file called tuple.ts, and add the following code:

const organizedArray: [number, string, boolean] = [0, 'text',      false];let myArray: [number, string, boolean];myArray = ['text', 0, false]console.log(myArray);

The preceding code looks fine for JavaScript, but in TypeScript, we must respect the variable type; here, we are trying to pass a string where we must pass a number.

2. In your Terminal, type the following command:

tsc tuple.ts

You will see the following error message:

tuple.ts(4,1): error TS2322: Type '[string, number, false]' is not assignable to type '[number, string, boolean]'. Type 'string' is ...