Chapter 02 — Variables, Constants, and Types

Level: beginner Estimated time: 3 hrs Prerequisites: Chapter 01 — Learn Dart from Scratch What you'll be able to do by the end: declare, type, modify, and display Dart variables (String, int, double, bool, num), choose between var, dynamic, final, const, and late, use string interpolation, and convert between types.

02.0 — Chapter Objectives

By the end of this chapter, you will be able to:

• create a variable;
• store text;
• store whole numbers;
• store decimal numbers;
• use Boolean values;
• understand the difference between var and an explicit type;
• understand dynamic;
• use final;
• use const;
• understand late;
• change the value of a variable;
• use string interpolation;
• perform simple conversions between types;
• correctly follow Dart naming conventions.

02.1 — What Is a Variable?

A variable is a location used to store a piece of information.

Picture a box:

+-------------------+
| nom               |
|-------------------|
| "Alex"            |
+-------------------+