optimize

2022/09/part1.js

@@ -35,7 +35,7 @@ const touching = (v1,v2) => [v1.distanceX(v2), v1.distanceY(v2)].every(
 export function moveOnce( head, tail, d ) {
     head.add(d);
 
-    if( touching(head,tail) ) return;
+    if( touching(head,tail) ) return tail.toString();
 
     const delta = head.clone().subtract(tail).normalize();
 
@@ -45,26 +45,23 @@ export function moveOnce( head, tail, d ) {
     }
 
     tail.add(delta);
+
+    return tail.toString();
 }
 
 const moveAround = (directives) => {
     const head = new Victor(0,0);
     const tail = new Victor(0,0);
 
-    const visited = [ tail.toString() ]
-
-    for ( const d of directives ) {
-        moveOnce(head,tail,d);
-
-        visited.push( tail.toString() );
-    }
-
-    return visited;
+    const move = d => moveOnce(head,tail,d);
+    return [
+        tail.toString(),
+        ...directives.map( move )
+    ]
 };
 
 export default R.createPipe(
     moveAround,
-    passthru( x => console.log(x) ),
     R.uniq,
-    R.countBy( R.identity )
+    moves => moves.length
 );