Std.Validate.checkField

fn

This is a callable function.

What it does

What one field's rules found.

Every rule is applied, not just up to the first that fails: a person

correcting a form wants the whole list, and giving it to them one at a time

turns one correction into as many round trips as there are mistakes.

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.