Dart by Example: Functions

// A simple function definition
yell(str) => str.toUpperCase();
// Functions can have type annotations
List lines(String str) {
  return str.split('\n');
}
main() {
  var poemLines = lines(poem);
  print(yell(poemLines.first));
  // functions are first-class
  var whisper = (String str) => str.toLowerCase();
  print(poemLines.map(whisper).last);
}
const poem = '''
The wren
Earns his living
Noiselessly.''';
 

$ dart functions.dart
THE WREN
noiselessly.

by @jryanio | source | license