The meaning of OPTIONAL is involving an option : not compulsory. How to use optional in a sentence.

Optional definition: left to one's choice; not required or mandatory.. See examples of OPTIONAL used in a sentence.

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OPTIONAL definition: 1. If something is optional, you can choose if you want to do it, pay it, buy it, etc.: 2. If…. Learn more.

Whenever you have a keyword argument with default value None, you should use Optional. So for your two examples, you have dict and list container types, but the default value for the a keyword …

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

If a value is present, apply the provided mapping function to it, and if the result is non-null, return an Optional describing the result. Otherwise return an empty Optional.

Feb 19, 2025 · The class template std::optional manages an optional contained value, i.e. a value that may or may not be present. A common use case for optional is the return value of a function that …

Definition of optional adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.