Online Dart Editor.

Starter snippet

import 'dart:async';

Future<int> sum(List<int> values) async {
  return values.fold(0, (a, b) => a + b);
}

void main() async {
  final total = await sum([1, 2, 3]);
  print('total: $total');
}

Struct / record usage

// Dart
struct Point { int x; int y; };

Point move(Point p, int dx, int dy) {
  return (Point){ p.x + dx, p.y + dy };
}

Collection iteration

for (size_t i = 0; i < n; i++) {
  process(data[i]);
}

Variables

final name = 'Ada'; int? maybeCount;

Loops

for (final item in items) { }  while (cond) { }

Functions / methods

String greet(String who) => 'Hello $who';

Comments

// line  /* block */  /// doc

Variables

int count = 0;
const char *name = "ct";

Loops

for (int i = 0; i < n; i++) { }
while (cond) { }

Parse → transform → emit

// Dart pipeline sketch
const input = readLines();
const output = input
  .map(line => line.trim())
  .filter(Boolean)
  .map(transform);
writeLines(output);

Error handling wrapper

// Dart
function runSafely(task) {
  try {
    return { ok: true, value: task() };
  } catch (err) {
    return { ok: false, error: String(err) };
  }
}

Can I run Flutter here?

This editor helps you write Dart; building Flutter apps still requires the Flutter SDK locally.