Sync

Task/Unicode-variable-names/Racket/unicode-variable-names.rkt

@@ -1,4 +1,12 @@
 #lang racket
+
+;; Racket can use Unicode in identifier names
+(define √ sqrt)
+(√ 256) ; -> 16
+;; and in fact the standard language makes use of some of these
+(λ(x) x) ; -> an identity function
+
+;; The required binding:
 (define Δ 1)
-(set! Δ (+ Δ 1))
-(displayln Δ)
+(set! Δ (add1 Δ))
+(printf "Δ = ~s\n" Δ) ; prints "Δ = 2"