Convert an array to hash, where keys are the indices

Question

I am transforming an array into a hash, where the keys are the indices and values are the elements at that index.

Here is how I have done it

# initial stuff
arr = ["one", "two", "three", "four", "five"]
x = {}

# iterate and build hash as needed
arr.each_with_index {|v, i| x[i] = v}

# result
>>> {0=>"one", 1=>"two", 2=>"three", 3=>"four", 4=>"five"}

Is there a better (in any sense of the word "better") way to do it?

Answer 1

arr = ["one", "two", "three", "four", "five"]

x = Hash[(0...arr.size).zip arr]
# => {0=>"one", 1=>"two", 2=>"three", 3=>"four", 4=>"five"}

Answer 2

Ruby < 2.1:

Hash[arr.map.with_index { |x, i| [i, x] }]
#=> {0=>"one", 1=>"two", 2=>"three", 3=>"four", 4=>"five"}

Ruby >= 2.1:

arr.map.with_index { |x, i| [i, x] }.to_h