Question

Given two hashes, I’m trying to replace a value in the first hash for a key that the second hash also has. To be specific, I have these two hashes:

data = {
  "study"       => "Lucid Study",
  "name"        => "Lucid Plan",
  "studyWillBe" => "Combination"
}

conditions = { "study" => "((current))" }

I want data to have its "study" key updated since conditions has that key. I want data to end up like this:

data = {
  "study"       => "((current))",
  "name"        => "Lucid Plan",
  "studyWillBe" => "Combination"
}

I got this far:

data = Hash[data.map {|k, v| [conditions[k] || k, v] }]

but that’s not quite doing the trick. Can anyone point me in the right direction?

Answer 1

You can do this

data.each {|k, v| data[k] = conditions[k] if conditions[k]}