List Comprehensions Enhancement

[Hannah Schroeter]

Hello!

In article <937299983snz at vision25.demon.co.uk>,
Phil Hunt <philh at vision25.demon.co.uk> wrote:
>[...]

>Or use a Smalltalk-like collect reserved word, e.g.:

>print [collect 3 * x for x in nums]
>print [collect (i,s) for i in nums, for s in strs]

Just to be sure, collect is NOT a reserved word in Smalltalk,
but about what "map" is in Python and most functional languages.

E.g.

#(1 2 3)
is an array constant.

#(1 2 3) collect: [:each | each * 2]

yields (2 4 6) as result.

The equivalent in Haskell would be
  map (\each -> each * 2) [1,2,3]
or in Python
  map (lambda each: each * 2, [1,2,3])

Regards, Hannah.