如何将Ruby哈希值转换为带有未引用值的Javascript对象？

Question

I want to output a Ruby hash as a JS object but for some values of the hash I need them without quotes, ie JS code. For example (something like) this Ruby:

{ foo: proc { 'someJavascriptFn()' } }.to_json

Would output this JS:

{ foo: someJavascriptFn() }

Is something like this possible without patching proc or hash ?

Answer 1

Yes, this is possible, but you'll need to build JSON yourself:

hash = {
  foo: proc { 'someJavascriptFn()' },
  bar: 42,
  baz: "Hello, world!"
}

content = hash.each_with_object([]) do |(k, v), acc|
  acc << ("#{k}: " << (Proc === v ? v.() : v.inspect))
end.join(",\n")
#⇒ "foo: someJavascriptFn(),\nbar: 42,\nbaz: \"Hello, world!\""
puts "{#{content}}"
#⇒ {foo: someJavascriptFn(),
#   bar: 42,
#   baz: "Hello, world!"}

Please note, that you might need to implement recursive call to this function if your input has nested structures.