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void main() {
  final String name = "Adam";

  print("=== ?? ===");
  // does not execute defaultValue()
  print(name ?? defaultValue());

  print("=== orDefault ===");
  // executes defaultValue()
  print(name.orDefault(defaultValue()));

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#!/bin/sh

# Usage: ./tool/run_coverage.sh test/all_tests.dart

(pub global list | grep coverage) || {
  # install coverage when not found
  pub global activate coverage
}

pub global run coverage:collect_coverage \

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Interactive CLI in Dart

Example how to build a interactive CLI application in Dart

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void main() {
  final Object something = TypeA();
  
  something.matchTypes({
    TypeA : () => print("found A"),
    TypeB : () => print("found B"),
  });
  
}

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import 'package:flutter/material.dart';

Future<void> main() async {
  runApp(Builder(
    builder: (context) => const MyApp(),
  ));
}

class MyApp extends StatelessWidget {
  const MyApp({

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How to use xrechnung-visualization

1. Install Ant

Install brew

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"

Then install ant using brew

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// @dart=2.12

/// A const implementation of Uri which crashes at first access in case the uri is invalid
class ConstUri implements Uri {
  /// Caches the static parsed uri
  ///
  /// The parsed uri can't be a mutable member field because that's not allowed for const classes
  static final _cache = <String, Uri>{};

  const ConstUri(String uri) : _uri = uri;

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import 'dart:async';

void main() async {
  // start future
  final future = doHardWork();
  // continously post progress
  final sub = showProgress().listen((_) {});
  // wait for completion
  await future;
  // stop progress

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import 'dart:math';

import 'package:flutter/material.dart';

void main() {
  runApp(Kata());
}

class Kata extends StatelessWidget {
  @override

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import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';

/// Written by PHNTM GmbH
void main() {
  runApp(const AdvancedOverlaySample());
}