Ruby hash equivalent of JavaScript's object initializer ES6 shorthand

Question

In JavaScript ES6 we can create objects where variable names become keys like this:

> let a = \'aaa\'
\'aaa\'

> let b = \'bbb\'
\'bbb\'

> { a, b }         


        

Answer 1

Not built in to the language. But what do you think of this?

https://gist.github.com/smtlaissezfaire/e81356c390ae7c7d38d435ead1ce58d2

def hash_shorthand(source_binding, *symbols)
  hash = {}

  symbols.each do |symbol|
    hash[symbol] = source_binding.local_variable_get(symbol)
  end

  hash
end

---

$ irb -r './hash_shorthand.rb' 
>> x = 10
>> y = 20
>> 
>> puts hash_shorthand(binding, :x, :y)
{:x=>10, :y=>20}

Only downside is that you'll need to pass the binding to get access to the local variables.