How to do it...

Just like in the previous project, you are going to create a playground function where every sub-function will demonstrate a different aspect of the strings:

1. Type in the following code and use it as the hub for all the other string examples:

void stringPlayground() {
 basicStringDeclaration();
 multiLineStrings();
 combiningStrings();
}

2. The first section demonstrates the ways in which you can declare string literals. Write the following function into your code, just under the stringPlayground function:

void basicStringDeclaration() {
  // With Single Quotes
  print('Single quotes');
  final aBoldStatement = 'Dart isn\'t loosely typed.';
  print(aBoldStatement);

  // With Double Quotes
  print("Hello, World");
  final aMoreMildOpinion = "Dart's popularity has skyrocketed with
  Flutter!";
  print(aMoreMildOpinion);
  // Combining single and double quotes
  final mixAndMatch =
      'Every programmer should write "Hello, World" when learning
       a new language.';
  print(mixAndMatch);
}

3. Dart also supports multi-line strings for cases where you have a text block that you want to print to the screen. The following example gets a little Shakespearean:

void multiLineStrings() {
  final withEscaping = 'One Fish\nTwo Fish\nRed Fish\nBlue Fish';
  print(withEscaping);

  final hamlet = '''
  To be, or not to be, that is the question:
  Whether 'tis nobler in the mind to suffer
  The slings and arrows of outrageous fortune,
  Or to take arms against a sea of troubles
  And by opposing end them.
  ''';

  print(hamlet);
}

4. Finally, one of the most common tasks programmers perform with strings is composing them to make more complex strings. Dart supports both the traditional method of concatenation, as well as a more modern method called string interpolation. Type in the following blocks of code to get a feel for both techniques:

void combiningStrings() {
 traditionalConcatenation();
 modernInterpolation();
}

void traditionalConcatenation() {
 final hello = 'Hello';
 final world = "world";

 final combined = hello + ' ' + world;
 print(combined);
}

void modernInterpolation() {
 final year = 2011;
 final interpolated = 'Dart was announced in $year.';
 print(interpolated);

 final age = 35;
 final howOld = 'I am $age ${age == 1 ? 'year' : 'years'} old.';
 print(howOld);
}

5. Now, all we have to do to run this code is update main.dart so that it points this file to a new file. Replace the top of main.dart with the following code:

main() {
 variablePlayground();
 stringPlayground();
}