You can define a method "=>" in Object as:
=> aBlock
^ aBlock value: self
That would allow you to write expressions like this:
7 => [ :x | x+3 ] => [ :x| x*3 ],
if you further define "=>" in Array as:
=> aBlock
^ aBlock valueWithArguments: self
you are able to write your example:
(([ :f :g | [ :x | f (g x) ] ]) [:x | x + 1] [:x | x - 1]) 5
as:
5 => ({ [:x | x + 1]. [:x | x - 1]} => [ :f :g | [ :x | x => g =>f ] ]).
It reads from left to right where yours is the usual Arabic (right to left)
favoured in functional style.
