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2048.bqn

@@ -1,7 +1,8 @@
 #!/usr/bin/env BQN
+# 2048 game
 # The game is controlled with the vim movement keys:
-# h: left, j: down, k: up, l: right
-# it needs a VT-100 compatible terminal
+# h: left, j: down, k: up, l: right, q: quit
+# needs a VT-100 compatible terminal
 
 Merge←{𝕩 0⊸≠⊸/↩ ⋄ m←<`=⟜«𝕩 ⋄ 4↑(¬»m)/𝕩×1+m}⌾⌽ # Merge a single row to the right
 Step←Merge˘    # Merges each row of the board
@@ -16,7 +17,7 @@ Win←∨´·∨˝2048⊸= #  Winning condition, 2048!
 board←Spawn 4‿4⥊0
 e←@+27
 •term.RawMode 1 
-Quit←{•Out e∾"[?12l"∾e∾"[?25h" ⋄ •Exit 𝕩}
+Quit←{•Out e∾"[?12l"∾e∾"[?25h" ⋄ •Exit 𝕩} # Restores the terminal and exits
 •Out e∾"[?25l"∾e∾"[2J"∾e∾"[H" # Cursor to origin, hide it and clear screen
 {𝕤⋄
     •Out e∾"[H"∾e∾"[2J" # Cursor to origin
@@ -24,7 +25,7 @@ Quit←{•Out e∾"[?12l"∾e∾"[?25h" ⋄ •Exit 𝕩}
     •Show board 
 
     key←•term.CharB @ # Read key
-    ⊑key∊"hjklq"?
+    ⊑key∊"hjklq"? # Valid key?
       {𝕤⋄•Out e∾"[?12l"∾e∾"[?25h"⋄ Quit 0}⍟(key='q')@ # Quit key?
       move←⊑(key="hjkl")/Left‿Down‿Up‿Right # Get movement function from the key
       {𝕤⋄board↩Spawn∘Move 𝕩}⍟(Move⊸≢) board # Generate the next board if the move is valid
@@ -33,4 +34,4 @@ Quit←{•Out e∾"[?12l"∾e∾"[?25h" ⋄ •Exit 𝕩}
       {𝕤⋄•Out "You win!" ⋄ Quit 0}⍟Win board
       {𝕤⋄•Out "You lose!"⋄ Quit 1}⍟Lose board
     ; @
-}•_While_{𝕤⋄¬Lose board}@
+}•_While_{𝕤⋄1}@