new tasks

Task/Arrays/Racket/arrays.rkt

@@ -0,0 +1,12 @@
+#lang racket
+
+;; import dynamic arrays
+(require data/gvector)
+
+(define v (vector 1 2 3 4))   ; array
+(vector-ref v 0)              ; 1
+(vector-set! v 1 4)           ; 2 -> 4
+
+(define gv (gvector 1 2 3 4)) ; dynamic array
+(gvector-ref gv 0)            ; 1
+(gvector-add! gv 5)           ; increase size