On 13/09/2016 22:20, Ian Kelly wrote:
On Tue, Sep 13, 2016 at 2:57 PM, <rgrigo...@gmail.com> wrote:
It would help newbies and prevent confusion.
Ada uses "for".
C++11 uses "for".
Dart uses "for".
Go uses "for".
Groovy uses "for".
Java uses "for".
JavaScript uses "for".
MATLAB uses "for".
Objective-C uses "for".
Pasceal uses "for".
Perl moved from "foreach" to just "for" in Perl 6.
Ruby uses "for".
Scala uses "for".
Swift uses "for".
And Fortran uses "do".
My own language uses "for", "forall" and "foreach". (Apparently PHP also
has a choice, according to another post.)
"for" only iterates over an integer sequence. "forall" over the values
in an object (such as a list), similar to Python. (And "foreach" breaks
apart certain kinds of object, such as the bits in an integer, and
iterates over those).
Probably "for", "forall" and "foreach" could be combined (perhaps with a
conversion to drive the the kind of iteration desired), but I think it's
useful to see "for" and /know/ it's a basic loop. It also makes it
easier to optimise, as well as allowing a stripped-down version that
only counts, or repeats forever).
Value Iterates over:
For: Forall: Foreach:
1..3 1,2,3 1,2,3 --
(10,20,30) 1,2,3 10,20,30 --
"ABC" 1,2,3 "A","B","C" 65,66,67 (works with both)
100 0,1,2...63 -- 0,0,1,0,0,1,1,0,...0
Getting back to Python, it only has one kind of for-loop and it has
decided to call it "for". It's just one minor thing (among many) that
has to be learned.
--
Bartc
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