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

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Interactive CLI in Dart

Example how to build a interactive CLI application in Dart

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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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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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Number to LCD Kata

Kotlin coding dojo no. 8: convert a given integer number to a LCD style number, see Part 1 of NumberToLCDKata

    0123456789
         
         
         |
         V

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import 'dart:convert';

import 'package:deep_pick/deep_pick.dart';
import 'package:http/http.dart' as http;

Future<void> main() async {
  /// Request data from a json API
  final response = await http.get("https://pokeapi.co/api/v2/pokemon/1");
  final json = jsonDecode(response.body);

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import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: HomePage(),
    );