reduce lines of code

aoc2020/lib/aoc20201203.dart

@@ -6,9 +6,9 @@ class AOC20201203 extends AOCBase {
   static const tree = '#';
 
   int indexWrap({int index, int width}) => index % width;
+
   int treeTest({int index, String line}) {
-    var width = line.length;
-    var testChar = line[indexWrap(index: index, width: width)];
+    var testChar = line[indexWrap(index: index, width: line.length)];
     return testChar == tree ? 1 : 0;
   }
 
@@ -34,21 +34,11 @@ class AOC20201203 extends AOCBase {
     var filename = (test ?? false) ? classStringTest : classString;
     var mylist = await ReadData.readFileString(filename);
 
-    var slopes = <Point>[
-      Point(1, 1),
-      Point(3, 1),
-      Point(5, 1),
-      Point(7, 1),
-      Point(1, 2),
-    ];
+    var slopes = <Point>[Point(1, 1), Point(3, 1), Point(5, 1), Point(7, 1), Point(1, 2)];
     answerB = 0;
     for (var slope in slopes) {
       var trees = tobogganRide(hill: mylist, start: Point(0, 0), slope: slope);
-      if (answerB == 0) {
-        answerB = trees;
-      } else {
-        answerB *= trees;
-      }
+      answerB = (answerB == 0) ? trees : answerB * trees;
     }
   }
 }