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Returns #t
if object is a vector; otherwise returns
#f
.
procedure: vector-length vector
Returns the number of elements in vector.
procedure: vector-ref vector k
Returns the contents of element k of vector. K must be a valid index of vector.
(vector-ref '#(1 1 2 3 5 8 13 21) 5) => 8
procedure: vector-set! vector k object
Stores object in element k of vector and returns an unspecified value. K must be a valid index of vector.
(let ((vec (vector 0 '(2 2 2 2) "Anna"))) (vector-set! vec 1 '("Sue" "Sue")) vec) => #(0 ("Sue" "Sue") "Anna")
procedure+: vector-first vector
procedure+: vector-second vector
procedure+: vector-third vector
procedure+: vector-fourth vector
procedure+: vector-fifth vector
procedure+: vector-sixth vector
procedure+: vector-seventh vector
procedure+: vector-eighth vector
These procedures access the first several elements of vector in the obvious way. It is an error if the implicit index of one of these procedurs is not a valid index of vector.
procedure+: vector-binary-search vector key<? unwrap-key key
Searches vector for an element with a key matching key,
returning the element if one is found or #f
if none. The
search operation takes time proportional to the logarithm of the length
of vector. Unwrap-key must be a procedure that maps each
element of vector to a key. Key<? must be a procedure that
implements a total ordering on the keys of the elements.
(define (translate number) (vector-binary-search '#((1 . i) (2 . ii) (3 . iii) (6 . vi)) < car number)) (translate 2) => (2 . ii) (translate 4) => #F
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