REBOL 3 Datatypes: Action!

Concept

This is a variant of a native! function that is standardized across datatypes. (They implement a set of common polymorphic functions.)

For example, the insert function is an action! function. It performs the same abstract operation over a variety of datatypes:

insert "string" 123
insert [a b c] 123

The same is true for the add action (which implements the + operator):

add 1 2
add 1:11 2:22
add 1.2.3 4.5.6
add 80% 10%

Note that not all actions apply to all datatypes. For example, insert is not used for integer! types and add is not used for string! types.

Action functions are optimized, and new actions cannot be added to the system.

List of Actions

A complete list of action functions can be found in system/catalog/actions.

They are listed below.

Magnitude (scalar) oriented: add subtract multiply divide remainder power and~ or~ xor~ negate complement absolute random round odd? even?

Series oriented: head tail head? tail? past? next back skip at index? length? pick find select reflect make to copy take insert append remove change poke clear trim swap reverse sort

Port oriented: create delete open close read write open? query [bad-link:functions/modify.txt] update rename