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Associative Array (Delphi and Corel Paradox Cross Reference Guide)

By Mike Prestwood

Delphi versus Corel Paradox: A side by side comparison between Delphi and Corel Paradox.

Data Structures

Data structures allow you to store and work with data. Common data structures include arrays, associative arrays, etc.

Associative Array

[Other Languages]

A set of unique keys linked to a set of values. Each unique key is associated with a value. Think of it as a two column table. MyArray['CA'] = 'California' MyArray['AR'] = 'Arizona'

Languages Focus

Associative arrays are also known as a dictionary or a hash table in other languages.

Delphi: TStringList Assoc Array

Object Pascal doesn't have a native associative array, but you can use a TStringList the same way. (Alternatively, search the Internet for TStringHash and THashedStringList classes for implementations of a true associative array).

Syntax Example:

var
  StateList : TStringList;
begin
  StateList := TStringList.Create;

  StateList.CommaText := 'CA=California, FL=Florida';

  ShowMessage('FL is ' + StateList.Values['FL']);
end;

Associative Arrays in Delphi/Object Pascal (Use TStringList)

Corel Paradox: DynArray

In ObjectPAL associative arrays are known as dynamic arrays.

Syntax Example:

var
  myDynArray   DynArray[] String
endVar

myDynArray["Last_Name"] = "Spitz"
myDynArray["First_Name"] = "Randy"

myDynArray.view()

ObjectPAL Associative Array (DynArray)