Std.EnumMap.find

fn

This is a callable function.

What it does

The value stored under a key, or None when the key is outside the domain.

For a key that arrived from outside the program — parsed from a file, read

off a request — where being outside the domain is an input to handle rather

than a defect to stop for.

Read the signature

• The text after the name is the type checked by Pudu.
• Read arrows from left to right: inputs come first, and the final type is returned.
• & borrows a value for this call instead of moving or copying it.
• Names inside [ ] are type arguments, such as the item type held by a collection.
• Option holds Some(value) or None when no value is available.