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Rails Forum - Ruby on Rails Help and Discussion Forum » Ruby Programming » is it possible to search for a string in an array without iterating?
Say A = ["hello", "ruby", "world"]
Is it possible to find out if the string "rub" exists in A without iterating through each element? For e.g. something similar to A.include?("ruby")
To access an array, which inherently has elements, 'without iterating through each element', is on the face of it, impossible.
In that case I'm assuming A.include?("ruby") must also be iterating through all it's elements - is there a built in function that lets you search through the array then?
It does, as do things like detect, reject, etc.
Take a look at Enumerable, the Array class implements these methods:
http://apidock.com/ruby/Enumerable
You can do the following
Array.select{|v| v =~ /element/}
This will return another array with those lines that are matching. I used this recently to search the contents of a file that I read in using readlines.
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