RedBrogdon

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

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This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

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RedBrogdon

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

final response = await http.get(myEndpointUrl);
if (response.statusCode == 200) {
  // use the data in response.body
} else {
  // handle a failed request
}

RedBrogdon

final myObject = serializers.deserializeWith(
    SimpleObject.serializer, json.decode(aJsonString));

RedBrogdon

final myObject = SimpleObject.fromJson(json.decode(aJsonString));

RedBrogdon

import 'dart:convert';

try {
  final parsed = json.decode(aJsonStr); 
} on FormatException catch (e) {
  print("That string didn't look like Json.");
} on NoSuchMethodError catch (e) {
  print('That string was null!');
}

RedBrogdon

final dynamicListOfInts = json.decode(aJsonArrayOfInts);

// Create a strongly typed list with references to the data that are casted
// immediately. This is probably the better approach for data model classes.
final strongListOfInts = List<int>.from(dynamicListOfInts);

// Or create a strongly typed list with references that will be lazy-casted
// when used.
final anotherStrongListOfInts = List<int>.from(dynamicListOfInts);

RedBrogdon

{
  "aString": "Blah, blah, blah.",
  "anInt": 1,
  "aDouble": 1.0,
  "aListOfStrings": ["one", "two", "three"],
  "aListOfInts": [1, 2, 3],
  "aListOfDoubles": [1.0, 2.0, 3.0]
}

RedBrogdon

class SimpleObject {
  const SimpleObject({
    this.aString,
    this.anInt,
    this.aDouble,
    this.aListOfStrings,
    this.aListOfInts,
    this.aListOfDoubles,
  });

RedBrogdon

return SimpleObject(
  aString: json['aString'] ?? "",
  anInt: json['anInt'] ?? 0,
  aDouble: json['aDouble'] ?? 1.0,
  aListOfStrings: List.from(json['aListOfStrings'] ?? []),
  aListOfInts: List.from(json['aListOfInts'] ?? []),
  aListOfDoubles: List.from(json['aListOfDoubles'] ?? []),
);

RedBrogdon

class SimpleObject {
  SimpleObject({
    this.aString,
    this.anInt,
    this.aDouble,
    this.aListOfStrings,
    this.aListOfInts,
    this.aListOfDoubles,
  });