DifferenceOfSquares

DifferenceOfSquares.dart

import 'dart:math';

void main() {
  var d = DifferenceOfSquares();
  var sum = d.differenceOfSquares(10);
  print(sum);
}

class DifferenceOfSquares {
  int sumOfSquares(int inputInt) => List<int>.generate(inputInt, (i) => i + 1)
      .map((x) => x * x)
      .reduce((a, b) => a + b);

  int squareOfSum(int inputInt) => pow(
      List<int>.generate(inputInt, (i) => i + 1).reduce((a, b) => a + b), 2);

  int differenceOfSquares(int inputInt) =>
      squareOfSum(inputInt) - sumOfSquares(inputInt);
}