Pascal · Medium

Lesson 1 · On the house

Procedural types and method pointers

Store routines in variables: function types, method pointers (of object), and callbacks.

Lesson 2

Properties

Declare properties with read/write fields or accessor methods, indexed and default array properties.

Lesson 3

Interfaces

Declare interfaces, implement several on one class, query with Supports and as, and rely on reference counting.

Lesson 4

Advanced records

Records with methods, constructors, properties, and visibility using {$modeswitch advancedrecords}.

Lesson 5

Operator overloading

Overload arithmetic, comparison, and conversion operators as class operators on records.

Lesson 6

Class and type helpers

Extend existing classes and built-in types with helper methods without subclassing.

Lesson 7

Generics.Collections

TList<T>, TDictionary<K,V>, sorting with comparers, and iterating pairs.

Lesson 8

Custom enumerators

Make your own types work with for-in by providing GetEnumerator, MoveNext, and Current.

Lesson 9

Streams

TMemoryStream, TFileStream, TStringStream: write, seek, read, and copy binary data.

Lesson 10

Formatting and string utilities

Format specifiers, StringReplace, Trim, Pos/PosEx, IntToHex, and parsing with TryStrToInt.