Feature/map with is in

[knmsk]

Fixes #45

Proposed Changes

• Added isInKeys, isNotInKeys, isNotInValues and isInValues

[gabrielerzinger]

Hello @kino-massaki, I don't know if I followed the idea here, however, wouldn't it be better to name it as

containsKeys
notContainsKeys

and the correspondent ones to values?

Other than the names, I think this would be a great contribution

[knmsk]

@gabrielerzinger the idea here is to cover the other logic that the isInKeys or isNotInKeys could not. The methods can be renamed to containsKeys and notContainsKeys and i think maybe is better to refactor the class to match the same pattern.

[gabrielerzinger]

@kino-massaki cool, would you be willing to do that?

@rodolphocouto if you could share your opinion on that matter

[knmsk]

@gabrielerzinger actually containsKey and notContainsKey already exists, i think taht it should stay the same as is, to match the function for iterables and array.
@rodolphocouto any thoughts?