Get all keys in hash with same value

Question

I am trying to get all the keys with the same value from a hash and put them into an array as separate entries. I have this line of code but it sends everything in as a sing

Answer 1

Or even better, yet simpler:

h.select { |k,v| v == h.values.max }.keys

For example,

h = { "a" => 1, "b" => 2, "c" => 2 }
# implement the above solution
h.select { |k,v| v == h.values.max }.keys
    #=> ["b", "c"]

Hopefully, that's what you'd want! :)

Answer 2

I suggest you construct a hash rather than an array.

h = { a: 1, b: 2, c: 1, d: 3, e: 2 }

h.each_with_object({}) { |(k,v),g| (g[v] ||= []) << k }
  #=> {1=>[:a, :c], 2=>[:b, :e], 3=>[:d]} 

This answers the question posed by the title of the question.

Answer 3

Maybe this?

h.select {|k, v| v == val}.keys.each {|k| @highest_wf_words << [k]}

Or this:

@highest_wf_words.concat(h.select {|k, v| v == val}.keys.map {|k| [k]})