Including range error


#1

I wrote the following command

myRanges = [(0…2), (2…5), (5…10), (10…15), (15…25)]

myRanges.each_pair {|index, aRange| index if aRange.include?(1)}
I would like to get 0 as a result since 1 is falling into the first
range…

but I got an error

undefined method `each_pair’ for [0…2, 2…5, 5…10, 10…15,
15…25]:Array

how should I write it, if I want to get the index of the range where a
given number is falling…

thanks for your help

joss


#2

Alle sabato 16 giugno 2007, Josselin ha scritto:

undefined method `each_pair’ for [0…2, 2…5, 5…10, 10…15,
15…25]:Array

how should I write it, if I want to get the index of the range where a
given number is falling…

thanks for your help

joss

each_pair is not a method of Array. If you need both the index and the
element
in the block, you need to use each_with_index, which passes the block
the
element and the index. Your code would become:

myRanges.each_with_index{|aRange, index| index if aRange.include?(1)}

This removes the error, but doesn’t give the result you expect, because
each_with_index returns the receiver (myRanges), in this case. If you
want to
stop the iteration when a range including 1 is found, and return its
index,
you need to break the loop explicitly:

myRanges.each_with_index{|aRange, index| break index if
aRange.include(1)}

I hope this helps

Stefano