Data Types & Type Systems

A type tells the compiler what operations are legal on a value and how many bytes to reserve for it. Type systems are the first line of defence in any language — understanding how they work shapes every design decision you make.

This track covers three lessons:

• Primitive and composite types — atoms of a type system, how composites are built, and why memory layout matters for performance
• Static, dynamic, strong, and weak typing — when type errors are caught, implicit coercions, and type inference
• Structural typing and generics — duck typing vs explicit declarations, and writing code that is reusable without losing type safety