Dart 1.1.1

Version of implementation Dart of programming language Dart

A version of Dart released on January 16, 2014

Dart Editor 1.1.1

Examples:

Hello, World! - Dart (485):

The “fat arrow” ( => expr; ) syntax is a shorthand for { return expr; }.

main() => print("Hello, World!");

Factorial - Dart (486):

This example uses recursive factorial definition. int datatype is an integer of arbitrary size.

int factorial(int n) => n == 0 ? 1 : n * factorial(n - 1);

main() {
  for (int i = 0; i <= 16; ++i) {
    print('$i! = ${factorial(i)}');
  }
}

Factorial - Dart (487):

This example uses iterative factorial definition.

main() {
  int fact = 1;
  for (int i = 0; i <= 16; ++i, fact *= i) {
    print('$i! = $fact');
  }
}

Fibonacci numbers - Dart (488):

This example uses recursive definition of Fibonacci numbers. Note that the language requires explicit conversion from int to String.

int fibonacci(int n) => n <= 2 ? 1 : fibonacci(n - 2) + fibonacci (n - 1);

main() {
  String output = "";
  for (int i = 1; i <= 16; ++i) {
    output += fibonacci(i).toString() + ", ";
  }
  print(output + "...");
}

Quadratic equation - Dart (489):

import 'dart:io';
import 'dart:math' show sqrt;

int readInt() {
  String input = stdin.readLineSync();
  return int.parse(input);
}

main() {
  int A, B, C;
  try {
    A = readInt();
    B = readInt();
    C = readInt();
  }
  on FormatException {
    print("Coefficient is not a number.");
    return;
  }
  if (A == 0) {
    print("Not a quadratic equation.");
    return;
  }
  int D = B * B - 4 * A * C;
  double p1 = - B / 2.0 / A;
  double p2 = sqrt(D.abs()) / 2.0 / A;
  if (D == 0) {
    print("x = $p1");
  } else {
    if (D > 0) {
      print("x1 = ${p1 + p2}");
      print("x2 = ${p1 - p2}");
    } else {
      print("x1 = ($p1, $p2)");
      print("x2 = ($p1, ${-p2})");
    }
  }
}

splitMapJoin splits the string into parts that match the pattern and parts that don’t match it, converts each part using corresponding function (in this case capitalizes matches and removes non-matches), and combines the results into a new string.

import 'dart:io';

main() {
  String text = stdin.readLineSync().toLowerCase();
  String capitalize(Match m) => m[0].substring(0, 1).toUpperCase() + m[0].substring(1);
  String skip(String s) => "";
  print(text.splitMapJoin(new RegExp(r'[a-z]+'), onMatch: capitalize, onNonMatch: skip));  
}