subtracting arrays

[Jason Lillywhite]

I suspect there is a cleaner way to do this with inject or collect.

a = [1,2,3]
b = [1,1,1]
c = []
i = 0
while i < 3 do
c << a - b
i += 1
end

p c

=> [0, 1, 2]

I tried a collect but can't figure out how to get variables from outside
the block to work inside the block. I was thinking something like
c = []
c.collect {|a,b| a - b}

but that is not it.

 

[Avdi Grimm]

I suspect there is a cleaner way to do this with inject or collect.

=> [0, 1, 2]

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Avdi

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[Avdi Grimm]

while i < 3 do
c << a - b
i += 1
end

BTW, this kind of loop is what Enumerable#each_with_index is for.

--
Avdi

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Developer Blog: http://avdi.org/devblog/
Twitter: http://twitter.com/avdi
Journal: http://avdi.livejournal.com

 

[Jason Lillywhite]

OK, I see.

so this works:

a = [1,2,3]
b = [1,1,1]
c = []
i = 0
while i < 3 do
c << a - b
i += 1
end

p c.each_with_index {|item,index|}

Thanks.