ahoge

  'x: $x, y: $y'

  'x: ' + x + ', y: ' + y

  import 'dart:async';
  import 'dart:io';
  main() {
    var file = new File('/sys/class/leds/beaglebone:green:usr0/brightness');
    var state = 0;
    new Timer.periodic(new Duration(seconds: 2), (_) {
      state = 1 - state;
      file.writeAsStringSync('0$state', flush: true);
    });
  }

    array.reduce((a, b) => a + b, 0);

    function sum(array) {
      return array.reduce((a, b) => a + b);
    }

    function sum(array) {
      let acc = 0;
      for(let val of array) {
        acc += val;
      }
      return acc;
    }