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Every function is classified along a few axes — what kind of thing it is, how it consumes iterables, what it accepts as input, what it returns, and whether it's pure. Click any tag to see every function carrying it.

• accepts iterable 54 — Works with arrays, Iterators, or Generators interchangeably.
• accumulator 5 — Self-returning factory — each call returns a fresh copy with more state until finalised.
• composer 6 — Takes several callables and stitches them into a single new callable.
• higher-order 49 — Takes one or more callables (predicates, mappers, comparators) as arguments.
• lazy 18 — Returns a Generator; values produced on demand. Never fully materialises the source.
• predicate 34 — Tests a value and returns true or false.
• pure 145 — No side effects — same input always produces the same output, given any callables passed in are themselves pure.
• reducer 18 — Collapses a whole collection down to a single result.
• returns bool 34 — Ultimately resolves to true or false.
• returns Closure 138 — The outer call binds arguments and hands back a reusable Closure — no answer is computed yet.
• returns value 5 — Resolves to a single concrete value (not another Closure, not a collection).
• short-circuit 7 — Stops consuming the source the moment it has enough to answer. Safe with infinite Generators.
• terminal 28 — Always consumes the entire source before returning. Do not use with infinite Generators.
• throws 14 — Can raise an exception on bad input. The exception type is listed in the Details section.
• transformer 79 — Takes a value and returns a new value of the same or related kind — no reduction.
• variadic 22 — Accepts any number of arguments of the same kind via ...$args.