On 1/1/21 10:47 PM, Patrick R. Michaud wrote:
On Fri, Jan 01, 2021 at 05:41:04PM -0800, ToddAndMargo via perl6-users wrote:
On 1/1/21 6:32 AM, David Santiago wrote:
say $_ for {0.1+$_}...^5
Is there a way to do this without the finger wagging?
say $_ for {0.1+$_}...^2
If you're going to a sequence operator ("...") instead of a range operator
(".."), then you can specify the increment this way and it may be more readable:
> say $_ for 0.1, 0.2 ...^ 2;
Raku will auto-deduce the sequence from the values in the list on the LHS of
the sequence operator:
> say $_ for 0.6, 1.1 ...^ 10;
This can be of course extended -- to count from $a up to $b in steps of $x, one
can write:
> say $_ for $a, $a+$x ...^ $b
Note that in these examples the caret is part of the sequence operator, it's
not a prefix to the $b argument.
Pm
Hi Patrick,
Awesome explanation. I have added the following
to my notes on "for" loops.
Anyone want to see the whole "for" notes, let me know
with a "ping Todd" on the subject line
-T
Looping using an rational (Rat, 0.45) and floating point
(Num, 0.45e0) (also avoids having to use a C loop):
Notes: it needs two points to know the iteration value
and an end point.
the tripple dots
the ^ immediately after three third dot
# loop from 0.0 to just before 2.0 by 0.3
> say $_ for 0.0, 0.3 ...^2.0;
0
0.3
0.6
0.9
1.2
1.5
1.8
# loop from 0.0e0 to just before 2.0e0 by 0.3e0
> say $_ for 0.0e0, 0.3e0 ...^2e0;
0
0.3
0.6
0.8999999999999999 # chuckle!
1.2
1.5
1.8
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