Better way for array to hash conversion

I have an array and I want to convert it to a hash. I want the array elements to be keys, and all values to be the same.

Here is my code:

h = Hash.new
myarr.each do |elem|
  h[elem] = 1
end

One alternative would be the following. I don't think it's very different from the solution above.

h = Hash[ *myarr.collect { |elem| [elem, 1] }.flatten ]

Is there a better way I can do this?

First of all, Hash[] is quite happy to get an array-of-arrays so you can toss out the splat and flatten and just say this:

h = Hash[myarr.map { |e| [ e, 1 ] }]

I suppose you could use each_with_object instead:

h = myarr.each_with_object({}) { |e, h| h[e] = 1 }

Another option would be to zip your myarr with an appropriate array of 1s and then feed that to Hash[]:

h = Hash[myarr.zip([1] * myarr.length)]

I'd probably use the first one though.