From bf84e85126b93048c09fab5f5d0addf0c72690a1 Mon Sep 17 00:00:00 2001
From: John Benediktsson <mrjbq7@gmail.com>
Date: Tue, 10 Sep 2019 04:52:59 -0700
Subject: [PATCH] numbers-game: simplify for readability.

---
 extra/numbers-game/numbers-game.factor | 40 ++++++++------------------
 1 file changed, 12 insertions(+), 28 deletions(-)

diff --git a/extra/numbers-game/numbers-game.factor b/extra/numbers-game/numbers-game.factor
index 6fae3d99c5..83dd42392f 100644
--- a/extra/numbers-game/numbers-game.factor
+++ b/extra/numbers-game/numbers-game.factor
@@ -1,39 +1,23 @@
-USING: kernel math math.parser random io ;
+USING: combinators io kernel math.order math.parser random ;
 IN: numbers-game
 
-: printfl ( s -- )
-    print flush ;
-
-: writefl ( s -- )
-    write flush ;
-
-: read-number ( -- n )
-    readln string>number ;
-
 : guess-banner ( -- )
-    "I'm thinking of a number between 0 and 100." printfl ;
+    "I'm thinking of a number between 0 and 100." print flush ;
 
-: guess-prompt ( -- ) "Enter your guess: " writefl ;
+: guess-number ( -- n )
+    "Enter your guess: " write flush readln string>number ;
 
-: too-high ( -- ) "Too high" printfl ;
-
-: too-low ( -- ) "Too low" printfl ;
-
-: correct ( -- ) "Correct - you win!" printfl ;
-
-: inexact-guess ( actual guess -- )
-     < [ too-high ] [ too-low ] if ;
-
-: judge-guess ( actual guess -- ? )
-    2dup = [ 2drop correct f ] [ inexact-guess t ] if ;
-
-: number-to-guess ( -- n ) 100 random ;
+: correct? ( actual guess -- ? )
+    <=> {
+        { +lt+ [ "Too high" print flush f ] }
+        { +eq+ [ "Correct - you win!" print flush t ] }
+        { +gt+ [ "Too low" print flush f ] }
+    } case ;
 
 : numbers-game-loop ( actual -- )
-    dup guess-prompt read-number judge-guess
-    [ numbers-game-loop ] [ drop ] if ;
+    [ dup guess-number correct? not ] loop drop ;
 
 : numbers-game ( -- )
-    guess-banner number-to-guess numbers-game-loop ;
+    guess-banner 100 random numbers-game-loop ;
 
 MAIN: numbers-game