OTalk

An experimental programming language with relations to SMALLTALK, PYTHON, C++, MAGIK ...

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Class Exemaples

• Integer: Instances of class Integer represents integer values in the range of -2**29 to 2**29-1.
• Object: The universal superclass.
• Snapshot of class hierarchy:
  

      Object
      |
      +-- Boolean
      |   |
      |   |
      |   +-- True
      |   |
      |   +-- False
      |
      +-- Slotted
          |
          +-- Collection
              |
              ..
  

Calculating faculty

Integer.fak
    if self.eq(0)
    then
	^1
    else
	^self * (self - 1).fak
    endif

Calculating faculty (sequential version)

Integer.fak
    |res c|
    res = 1;
    c = self;
	while (c > 1)
       res = res * c;
       c = c - 1
    end;
    ^res

Value at a key in a dictionary

Dictionary.at(key)
    |i|
    i = self.indexFor(key);
    if i.eq(nil) then
        ^nil
    else
	^values.at(i)
    endif

Method for calculatin index for a key

Dictionary.indexFor(key)
    |i|
    i=0;
    # And now a really poor implementation.
    while (i < size) # Size is the instance variable size
        if keys.at(i).eq(key) 
    	then
	    ^i
    	endif;
    	i = i + 1
    end;
    ^nil

Every class library designer recognizes following:

True.||(other)
	^self

True.or(other)
	^self

True.&(other)
	^other

True.and(other)
	^other

True.not
	^false