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

4 votes110 views1 answer
How to change the padding of the snackbar in flutter
Dart
9 votes104 views4 answers
Flutter transparent color
Dart
3 votes105 views1 answer
Flutter listtile leading and title space
Dart
0 vote70 views1 answer
How to pass url parameter inside a webview flutter
Dart
1 vote115 views2 answers
Flutter fittedbox
Dart
19 votes144 views1 answer
Dart random number
Dart
0 vote127 views1 answer
FilterChip backgroung color opacity
Dart
0 vote117 views1 answer
How to remove arrows in flutter swipper
Dart
14 votes103 views4 answers
Flutter image asset
Dart
0 vote102 views2 answers
Flutter conditional parent widget
Dart