Pascal · Easy

Lesson 1 · On the house

Dynamic arrays

array of T, SetLength, Length/High, Copy, Insert/Delete, and reference semantics.

Lesson 2

Pointers and dynamic memory

Typed pointers, New/Dispose, nil, ^ dereference, @ address-of, and a linked list.

Lesson 3

Units

Split code into units with interface and implementation sections, initialization, and uses.

Lesson 4

Exceptions

raise, try/except with on E: class do, try/finally, custom exception classes, and SysUtils.

Lesson 5

Classes and objects

Class types, constructors, Free, fields, methods, properties, and visibility sections.

Lesson 6

Inheritance and polymorphism

Descendant classes, virtual and override, abstract methods, is and as, and class references.

Lesson 7

TStringList and Classes

Store, sort, split, and save text with TStringList, Values, and Delimiter.

Lesson 8

Generics

generic and specialize in objfpc mode, generic functions, and Generics.Collections lists and dictionaries.

Lesson 9

Recursion and sorting

Recursive functions, quicksort on arrays, comparator callbacks, and procedural types.

Lesson 10

Variant records and case

Records whose fields depend on a tag, tagless variants, and safe handling patterns.