F-Flat

F♭ (pronounced F-flat) is a toy language.

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Dictionary / Locals

Unlike many other languages, f♭ does not have a concept of variables or lambdas. Like most stack based languages the primary location for value storage is the stack. f♭ has a write once dictionary for storage of word definitions. Values within a dictionary cannot be overwritten or deleted. However, using child stacks (discussed later) dictionary words can be shadowed. (similar to JS scoping rules).

f♭> x: [ 123 ] ;
[ ]

f♭> x
[ 123 ]

f♭> x: [ 456 ] ;
Error: Cannot overwrite definition: x
[  ]

f♭> clr [ x: [ 456 ] ; x ] in x
[ [ 456 ] 123 ]

Word requirements

• Cannot contain a colon (:) (special meaning)
• Cannot start with a period .
• Cannot contain white space (space, new lines, tabs, or comma ,).
• Cannot contain brackets ( (){}[] ).
• Cannot contain quotes ( ‘”` )
• Cannot be numeric (starting with a numeric value is ok)
• Cannot begin with a hash (#)
• Cannot be a reserved word (null, true or false)