B.4 An example of console-dylan interactive functionality

The following example demonstrates the console environment's interactive functionality. In the example, the user starts console-dylan in interactive mode, opens the playground project, performs some arithmetic, defines a method, and then traces it:

MS-DOS> console-dylan
  Functional Developer(TM) ...
  Version ...
  Copyright (c) 1999-2000, Functional Objects, Inc.
  All rights reserved.

> :play
Opened project dylan-playground
Starting: dylan-playground 

> 1 + 2;
  $0 = 3

> define method factorial (x) if (x < 2) 1 else x * factorial(x - 1) end end;

> factorial(5);
  $1 = 120

> :trace factorial

> :set messages verbose
Messages: verbose

> factorial(6);
0: factorial (<object>): (6)
  1: factorial (<object>): (5)
    2: factorial (<object>): (4)
      3: factorial (<object>): (3)
        4: factorial (<object>): (2)
          5: factorial (<object>): (1)
          5: factorial (<object>) => (2)
        4: factorial (<object>) => (6)
      3: factorial (<object>) => (24)
    2: factorial (<object>) => (120)
  1: factorial (<object>) => (720)
0: factorial (<object>) => (#[720])
  $2 = 720

> :exit

d:\users\dylan\builds>

The commands described in this appendix can also be used in the Command Line window within the regular Functional Developer development environment. Choose File > Command Line... from the main window and use commands at the ? prompt.

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Getting Started with Functional Developer - 31 MAR 2000