maz
October 25, 2007, 9:25am
1
I’m sure there’s no chance of this ever changing but I’m disappointed
that the integer method “step”:
start.step(end, step_size)
...wasn't more like:
step_size.step(start, end)
...I just like having the start and end points grouped together with
the
step size singled out.
Who’s with me?
maz
October 25, 2007, 10:24am
2
From: Just Another Victim of the Ambient M.
start.step(end, step_size)
…wasn’t more like:
step_size.step(start, end)
…I just like having the start and end points grouped
together with the
step size singled out.
Who’s with me?
i’m w you. ruby is with you (quite).
irb(main):016:0> system “qri range.step”
------------------------------------------------------------- Range#step
rng.step(n=1) {| obj | block } => rng
Iterates over rng, passing each nth element to the block. If the
range contains numbers or strings, natural ordering is used.
Otherwise step invokes succ to iterate through range elements.
irb(main):018:0* (0…10).step(2) {|x| p x}
0
2
4
6
8
10
=> 0…10
obviously, by definition of range, it will not cater negative steps
irb(main):030:0> (10…0).step(-2) {|x| p x}
ArgumentError: step can’t be negative
maybe, before i request a change in step, i might as well request a
change in #succ /#next first, like succ receiving an optional argument,
eg…
1.succ #=> 2
(-1).succ #=> 0
1.succ(1) #=> 2
(-1).succ(1 #=> 0
1.succ(2) #=> 3
(-1).succ(2) #=> 1
1.succ(-1) #=> 0
(-1).succ(-1)#=> -2
so then,
irb(main):030:0> (10…0).step(-2) {|x| p x}
10
8
6
4
2
0
I believe facets already does the succ(-n) part, but does not handle
step(-n) which is pretty lame to me, imnho.
kind regards -botp
maz
October 25, 2007, 1:13pm
3
On Oct 25, 10:25 am, “Just Another Victim of the Ambient M.”
[email protected] wrote:
step size singled out.
Who’s with me?
You can help yourself
class Numeric
def mystep(from, to, &block)
raise ArgumentError unless block_given?
from.step(to, self) { |x| yield x }
end
end
5.step(10, 2) { |i| puts i }
2.mystep(5, 10) { |i| puts i }