Prelude Reference

The eucalypt prelude is a standard library of functions, operators, and constants that is automatically loaded before your code runs. You can suppress the prelude with -Q if needed, though this leaves a very bare environment (even true, false, and if are defined in the prelude).

Categories

• Lists -- list construction, transformation, folding, sorting (91 entries)
• Blocks -- block construction, access, merging, transformation (66 entries)
• Strings -- string manipulation, regex, formatting (36 entries)
• Numbers and Arithmetic -- numeric operations and predicates (30 entries)
• Booleans and Comparison -- boolean logic and comparison operators (12 entries)
• Combinators -- function composition, application, utilities (14 entries)
• Calendar -- date and time functions (8 entries)
• Sets -- set operations (14 entries)
• Random Numbers -- random number generation, monadic random: namespace (15 entries)
• Metadata -- metadata and assertion functions (4 entries)
• IO -- environment, time, argument access, and monad utility (80 entries)

370 documented entries in total.

Standard Libraries

These are not part of the prelude (they require an explicit import) but ship with eucalypt:

• Lens Library ({ import: "lens.eu" }) — composable lenses and traversals for reading and updating nested data: view, over, to-list-of, parts-of, at, ix, item, element, each, filtered, each-element, filtered-elements, _value, _key, ‹› path shorthand.