Optional definition, left to one's choice; not required or mandatory: Formal dress is optional. See more.


optional meaning: 1. If something is optional, you can choose if you want to do it, pay it, buy it, etc.: 2. not necessary or demanded but possible or available; ...


Optional definition is - involving an option : not compulsory. How to ... See the full definition for optional in the English Language Learners Dictionary. optional.


Define optional (adjective) and get synonyms. What is optional (adjective)? optional (adjective) meaning, pronunciation and more by Macmillan Dictionary.


optional meaning, definition, what is optional: if something is optional, you do not hav...: Learn more.


Optional definition: If something is optional , you can choose whether or not you do it or have it. | Meaning, pronunciation, translations and examples.


optional. If you can choose whether or not to do something, it is optional. Extra credit is always optional; death and taxes are not. When you buy a new car, you ...


Not mandatory; A decision can be made in this situation.


This allowed for Optional to be made conditionally Hashable , when ... So you can use any Optional<T: Hashable> as a dictionary key, directly!