Programming in Dart: Functions & Closures

Jun 21 2022 · Dart 2.16, Flutter, DartPad

Part 1: Meet the Function

06. Store a Function

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Previous episode: 05. Challenge: Create a Function Next episode: 07. Understand Typedef

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Functions are a great way to call code on demand. One convenient aspect of functions is that we can store them in variables and pass them around to other functions. In the second part of this course, you’ll see this in action. But for now, just know this is a great way to create dynamic and adaptable programs.

int multiply(int a, int b) {
    return a * b;
}

print(multiply(10, 10));

var myFunction = print();

var myFunction = multiply;

void main() {
    var scores = [54, 75, 32];
}

int processScores(List<int> scores, Function processor) {

}

int processScores(List<int> scores, Function processor) {
    var total = 0;

    return total;
}

for (var score in scores) {
    var number = processor(score, 2);
}

total += number;

total += (number is int) ? number : 0;

int processScores(List<int> scores, int Function(int, int) processor) {

for (var score in scores) {
    total += processor(score, 2);
}

void main() {
  var scores = [54, 75, 32];
  print(processScores(scores, multiply));
}