TypeScript

What is TypeScript?

Features of TypeScript

Some of the features that TypeScript introduces are as follows:

• Modules
• Data types
• Classes
• Access modifiers
• Multiline strings
• String interpolation

Modules

A module is simply a container for organizing and grouping our code that is then able to be exported and imported for use into another script, like so:

// importing module
import { IonicPage, NavController, NavParams } from 'ionic-angular';

// exporting module
export class AboutPage { /* class properties & methods contained in here */ }

Data types

Until ES6, JavaScript didn’t provide developers with the ability to specify the data type for their variables, so they would have to be declared, like so:

var firstName, lastName, age;

With TypeScript, we can explicitly declare the data types for each variable, known as type annotations, which help us ensure strict data and logic integrity in our coding.

If, for example, we were to ...