Programming in Dart: Functions & Closures

Jun 21 2022 · Dart 2.16, Flutter, DartPad

Part 1: Meet the Function

04. Understand Named Parameters

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Previous episode: 03. Implement Optional Parameters Next episode: 05. Challenge: Create a Function

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So far in defining functions, you will have noticed that often times, it’s difficult to determine the meaning of the value being passed into it.

bool isWithinTolerance(int value, [int min = 0, int max = 10]) {
  return min <= value && value <= max;
bool isWithinTolerance(int value, {int min = 0, int max = 10}) {
  return min <= value && value <= max;
print(isWithinTolerance(9, min: 7, max: 11));
print(isWithinTolerance(9, max: 11));
print(isWithinTolerance(9, max: 11, min: 5));
bool isWithinTolerance({ int value, int min = 0, int max = 10})
bool isWithinTolerance({ required int value, int min = 0, int max = 10})
print(isWithinTolerance(value: 9, max: 11, min: 5));