Sequence library

This page lists the public words currently defined in the top-level seq library module.

seq.ffp

Source: ff/lib/seq/seq.ffp
Import: .import <seq/seq>

Word	Stack effect	Description
unit	a -- [a]	Wraps a single value as a one-item quotation.
stack	.. -- [..]	Captures the current stack as a quotation.
in	.. [Q] -- ..'	Evaluates a quotation against a captured stack value layout.
pair	a b -- [a b]	Wraps two values as a quotation pair.
compose	[A] [B] -- [A then B]	Composes two quotations into one quotation.
map!	a* [B] -- b*	Applies a quotation to each stack item in place.
reduce!	a+ [B] -- r	Reduces stack items with a quoted reducer.
head!	a+ -- a	Returns the first item from a non-empty stack sequence.
tail!	a+ -- a*	Returns all but the first item from a non-empty stack sequence.
last!	.. a -- a	Returns the last item from the current stack sequence.
reduce_r!	a+ [B] -- r	Reduces stack items from the right.
foldr!	a* [B] z -- r	Right-folds stack items with an explicit seed.
reduce_l!	a+ [B] -- r	Reduces stack items from the left.
foldl!	a* [B] z -- r	Left-folds stack items with an explicit seed.
reverse!	a* -- a*	Reverses a stack-backed sequence in place.
filter!	a* [B] -- a*	Keeps only the items whose predicate quotation is truthy.
map	[A] [B] -- [C]	Builds a mapped quotation from an input quotation and mapper.
first	[A] -- a	Returns the first element of a quoted sequence.
tail	[A] -- [B]	Returns a quoted sequence without its first element.
last	[A] -- a	Returns the last element of a quoted sequence.
foldr	[A] [B] z -- r	Right-folds a quoted sequence with a seed value.
foldl	[A] [B] z -- r	Left-folds a quoted sequence with a seed value.
reverse	[A] -- [B]	Reverses a quoted sequence.
filter	[A] [B] -- [C]	Filters a quoted sequence with a predicate quotation.
sum!	.. -- n	Sums the current stack sequence.
product!	.. -- n	Multiplies the current stack sequence.
sum	[A] -- n	Sums a quoted sequence.
product	[A] -- n	Multiplies a quoted sequence.
length	[A] -- n	Returns the number of elements in a quoted sequence.
emptyq?	[A] -- flag	Tests whether a quoted sequence is empty.
seq=	[A] [B] -- flag	Tests quoted sequences for element-wise equality.