optional

noun

Something that is not compulsory, especially part of an academic course.

Wearing a mask is optional in some places.

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意味（1）

Something that is not compulsory, especially part of an academic course.

意味（2）

(programming, sometimes capitalized) In various programming languages, a kind of variable that is assigned a specific data type but may or may not hold an actual value.

In functional languages, there is a data type called the option type, also called the maybe type. Its purpose is to encapsulate a value, which is returned from a function. […] In Java 8, the Optional class has been added to serve as an option type.

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optional

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