In Ruby, how do I make a hash from an array?
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Published on 2010-05-31T12:12:04Z
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I have a simple array:
arr = ["apples", "bananas", "coconuts", "watermelons"]
I also have a function f
that will perform an operation on a single string input and return a value. This operation is very expensive, so I would like to memoize the results in the hash.
I know I can make the desired hash with something like this:
h = {}
arr.each { |a| h[a] = f(a) }
What I'd like to do is not have to initialize h, so that I can just write something like this:
h = arr.(???) { |a| a => f(a) }
Can that be done?
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