On 30 Jul 2009, at 22:23 , Jan Kaliszewski wrote:
30-07-2009 o 13:36:49 Masklinn <maskl...@masklinn.net> wrote:
On 30 Jul 2009, at 06:04 , alex23 wrote:
On Jul 30, 1:06 pm, r <rt8...@gmail.com> wrote:
2.) the .each method
container.each{|localVar| block}
This method can really cleanup some ugly for loops, although i
really
like the readability of for loops.
map(lambda localVar: <block>, sequence)
or:
def usefully_named_func(var):
<block>
return var
transformed = [usefully_named_func(v) for v in sequence]
The issue here is of course that `map` and comprehensions are
transformations. `#each` exists for effectful iterations (Ruby has
`#map` for the map operation). So the intent expressed by `#each`
and `map` isn't the same. Furthermore and this is the most
problematic limitation of Python here, `lambda` doesn't allow
complex transformations due to its restrictions, so one has to
switch to named functions which works but isn't sexy (and tends to
lower readability imo).
I don't see any real limitation. What's wrong in:
for localVar in container:
block
Well what's wrong with using that rather than `map`, `filter` or a
list comprehension? (and if you don't see what the limitations of
`lambda` are, you probably very rarely use it)
And ruby's container.each is very similar to Python's iter()
Uh… not at all…
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