In Ruby, suppose we have a 2-dimensional array, why is this syntax fine:
array.each do |x|
x.each do |y|
puts y
end
end
But this is not:
array.each{|x|.each{|y| puts y}}
Any ideas? Thanks
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2 Answers
This should be fine array.each{|x| x.each{|y| puts y}}
You forget to refer x first.
I.e. . is supposed to be left associate operator. If you have noting on the left side - this is an error.
2 Comments
Sergio Tulentsev
Ah, indeed, maybe that's what he missed. I thought he was pondering on "why the syntax is not what I'd like it to be"? :)
denis-bu
Yeah, I just realized it after I've put my answer. Update it a bit.
If you replace your do...end blocks with {...} carefully you'll find that your second form works the same as your first. But puts array accomplishes the same thing as this whole double loop.
If I may offer some polite meta-advice, your two Ruby questions today seem like you maybe were asked to do some things in a language you don't know, and are frustrated. This is understandable. But the good news is that, compared to many other languages, Ruby is built on a very small number of pieces. If you spend a little time getting really familiar with Array and Hash, you'll find the going much smoother thereafter.
