Std.Channel.fold

fn

This is a callable function.

What it does

Take values until the channel closes, combining them into one value.

The value is threaded rather than gathered by the step function, because a

function literal carries a copy of what it captured: a step assigning to a

variable outside itself would leave that variable as it found 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.
• Result makes success and recoverable failure part of the function's type.