Std.List.sumOr

fn

This is a callable function.

What it does

Every element added together, with a caller-supplied value for empty.

The form to reach for when nought is the right answer for nothing; sum

keeps the distinction for callers that need it.

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.