Delphi Basics : Of command

Delphi Basics
Of Keyword	Linking keyword used in many places

1 Case variable Of ...
2 type name = Set   Of range;
3 type name = Class Of class type;
4 var  name : Array Of type;
5 var  name : File  Of type;

Description

The Of keyword is used as a link in a number of Delphi declarations.

Related commands

Array		A data type holding indexable collections of data
Case		A mechanism for acting upon different values of an Ordinal
Class		Starts the declaration of a type of object class
File		Defines a typed or untyped file
Set		Defines a set of up to 255 distinct values

Example code : A simple example

// Full Unit code.
// -----------------------------------------------------------
// You must store this code in a unit called Unit1 with a form
// called Form1 that has an OnCreate event called FormCreate.

unit Unit1;

interface

uses
  Forms, Dialogs;

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation
{$R *.dfm} // Include form definitions

procedure TForm1.FormCreate(Sender: TObject);
var
  letters : set Of 'a'..'z';

begin
  // Set all of the set values on
  letters := ['a'..'z'];

  // See if a letter is lower case
  if 'g' in letters
  then ShowMessage('g is a lower case letter')
  else ShowMessage('g is not a lower case letter');
end;

end.

Hide full unit code

g is a lower case letter