Learning Dart

dart/difference-of-squares/lib/difference_of_squares.dart

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+import 'dart:math' show pow;
+
+class DifferenceOfSquares {
+  int squareOfSum(int v) {
+    int total = 0;
+    for(int i = 1; i <= v; i++) {
+      total += i;
+    }
+    return pow(total, 2) as int;
+  }
+
+  int sumOfSquares(int v) { 
+    int total = 0;
+    for(int i = 1; i <= v; i++) {
+      total += pow(i, 2) as int;
+    }
+    return total;
+  }
+
+  int differenceOfSquares(int v) => squareOfSum(v) - sumOfSquares(v);
+}