Types in Depth

Types in Depth

In this lesson — part of Data Deep Dive — you'll learn types in depth in Dart and why it matters in real work.

Why it matters

Types tell you what operations make sense and catch whole classes of bugs early.

Key ideas

• Common types: text, numbers, booleans
• Type conversion and coercion
• When to be explicit about types
• Type errors and how to read them

In practice

Here's how it looks in idiomatic Dart:

void main() {
  int n = 42;
  double d = 3.5;
  bool ok = true;
  String s = n.toString();   // int -> String
  int back = int.parse('100'); // String -> int
  print('$s $back $d $ok');
}

Dart note: Dart's core numeric types are int and double (both subtypes of num), and conversions use methods like toString() / int.parse() rather than casts.

Try it yourself

Exercise: In Dart, convert a number to text and back, and print both.

Recap

You now understand types in depth and can apply it in Dart. Mark this lesson complete and continue to the next one.