Returns the number of items in a collection.

Returns #t if a collection contains no items.

Retrieves an item from a collection.

Mutates an item in a collection.

Returns #t if a collection contains a particular item.

Removes an item from a collection, and returns it.

Deletes an item from a collection, without returning it.

Deletes all items from a collection.

Maps a function over a collection, preserving syntax information.

Constructs a new, mutable array.

Constructs a new, mutable array by repeating a value.

Appends one or more elements to the end of a deque.

Prepends one or more elements to the beginning of a deque.

Removes the deque's last element, and returns it.

Removes the deque's first element, and returns it.

Inserts one or more elements into a deque.

Increases a deque's size.

Reduces a deque's size.

Swaps an element with the deque's last element, then removes it and returns it.

Swaps an element with the deque's first element, then removes it and returns it.

Returns a sorted copy of a deque.

Sorts a deque in-place.

Tests whether one deque is the prefix of another.

Tests whether one deque is the suffix of another.

Searches within a deque.

Searches backwards within a deque.

Reverses a deque in-place.

Maps a function over a deque in-place.

Filters a deque in-place.

Combines an array of deques into one deque.

Constructs a table.

Inserts any number of key/value pairs into a table.

Returns #t if all of its arguments would occupy the same table entry when used as keys.