Dart what is a closure

1
Dart Closures Tutorial with Examples
https://o7planning.org/14061/dart-closures

2
Closures

A function can be created in the global scope or within the scope of another 
function. A function that can be referenced with an access to the variables 
in its lexical scope is called a closure, as shown in the following code:

<--

library function_closure;

// Function returns closure function.
calculate(base) {
  // Counter store
  var count = 1;
  // Inner function - closure
  return () => print("Value is ${base + count++}");
}

void main() {
  // The outer function returns inner
  var f = calculate(2);
  // Now we call closure
  f();
  f();
}

-->

Here is the result of the preceding code:

Value is 3
Value is 4

We have the calculate function, which contains the count variable and returns
a an inner function. The inner function has an access to the count variable 
because both are defined in the same scope. The count variable exists only 
within the scope of calculate and would normally disappear when the function 
exits. This does not happen in this case because the inner function returned 
by calculate holds a reference to count. The variable has been closed covered,
meaning it's within a closure.

Source: subscription.packtpub.com

Similar codes

2 votes167 views3 answers
Flutter portrait only
Dart
0 vote186 views1 answer
Padding media query flutter
Dart
14 votes176 views2 answers
Dart try catch
Dart
0 vote179 views1 answer
Flutter const advantag
Dart
0 vote181 views1 answer
Insert in array dart
Dart
0 vote172 views1 answer
Linear search dart
Dart
1 vote177 views1 answer
Install getx
Dart
15 votes191 views2 answers
Icons flutter to put a right
Dart
1 vote173 views1 answer
Inkwell in image flutter not working
Dart
0 vote197 views1 answer
Change color icon tabbar flutter
Dart