12 lines
291 B
Racket
12 lines
291 B
Racket
#lang scribble/manual
|
|
|
|
@(require "../doc-util/main.rkt")
|
|
|
|
|
|
@defproc[(vector-ref-lens [i exact-nonnegative-integer?]) lens?]{
|
|
Returns a lens that views an element of a vector.
|
|
@lenses-examples[
|
|
(lens-view (vector-ref-lens 2) #(a b c d))
|
|
(lens-set (vector-ref-lens 2) #(a b c d) "sea")
|
|
]}
|