In Ruby, how do I make a hash from an array?

Question

I have a simple array:

arr = [\"apples\", \"bananas\", \"coconuts\", \"watermelons\"]

I also have a function f that will perfo

Answer 1

h = arr.each_with_object({}) { |v,h| h[v] = f(v) }

Answer 2

This is what I would probably write:

h = Hash[arr.zip(arr.map(&method(:f)))]

Simple, clear, obvious, declarative. What more could you want?