This module provides a functional double-ended queue (deque, pronounced as “deck”).
Almost all procedures in this module are now a part of R7RS large. See R7RS変更不可な両端キュー, for description of the following procedures:
ideque ideque-unfold ideque-unfold-right ideque-tabulate ideque? ideque-empty? ideque-add-front ideque-add-back ideque-remove-front ideque-remove-back ideque-front ideque-back ideque-reverse ideque= ideque-ref ideque-take ideque-drop ideque-take-right ideque-drop-right ideque-split-at ideque-append ideque-zip ideque-map ideque-for-each ideque-for-each-right ideque-fold ideque-fold-right ideque-append-map ideque-filter ideque-remove ideque-find ideque-find-right ideque-take-while ideque-take-while-right ideque-drop-while ideque-drop-while-right ideque-span ideque-break ideque-any ideque-every ideque->list list->ideque ideque->generator generator->ideque
Creates an ideque of length n with all the elements being
init. If init is omitted,
#f is used.
This is provided just for the symmetry with other container data
structures; it’s not in srfi-134, and the portable code can use