Bach220   16 Feb 04

• Classes much improved. Instances may now be placed in a sequence without losing their identity, so constructs like seq[idx].memb work
• ‘method tags’ allow the specifying the class that a method is bound to. EX:
  method :Point:origin()
• Two new operators  && and &&= perform an append.
• New operator !! may be used in place of clone()
• Functions that return a sequence may now be indexed.
• printf style functions now understand a new format specifier %V to convert an object into a standardized string representation.
• A string statement outputs its string to stdout (for CGI)
• Both string statements and literal strings can evaluate embedded Bach expressions.
• Negative indexes may be used to reference from the ens of a sequence.
• Two new scope modifiers, public and  private replace the old  global which is now a synonym for  public .
• Variables default  to  private ;  defs and classes default to public .
   

Bach215    25 Dec 03

• New built-in function _is_() checks if sequence is instance of class.
• semicolon (‘;’) starts a line comment.
• Bugfix -- class members which are sequences now initialize to an empty string instead of zero.
• Better remainder() algorithm (I think).
• coroutine removed -- defs and methods become coroutines if yield is used.

Bach214    15 Dec 03

• Classes containing multiple copies of another class now work properly.
• Indexing a member now works  (class.member[n])
• Class members are now typechecked
• Sequence elements may be accessed as class instances with a new bit of syntax:
  pointlist[3]:Point.x
• type has been renamed to vartype (‘type’ is too useful to the user).
• A library math.b has been split off from bach.b.
• Added built-in functions abs(), min_max(), and mean().
• Added statistics fcts variance(), absdev(), stddev(), skew() and kurtosis().
• Error printout highlights the error line number.
  
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