Glossary
action An impure subroutine that relies on side effects to modify the state of an application but does not return a (meaningful) value; sometimes also called a procedure. See also pure. Discussed in Chapter 3.
algebraic data type A type that combines existing types through a combination of alternatives (sum) and aggregation (product). Many standard types, including tuples, options, lists, and trees, can be defined as algebraic data types. Discussed in Chapter 5.
anonymous function See function literal.
argument An input to a function or method, such as a value or a type. Also called parameter.
asynchronous, asynchronously The opposite of synchronous, synchronously.
callback 1. A piece of code registered for (single, multiple, or optional) ...
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