memoize 3.0.0

Returns cached result of function call when inputs were not changed from previous invocation.

Memoize

memoize returns cached result of function call when inputs were not changed from previous invocation.

Warning

memoize_dart now supports dart 2.12.0 and null safety since 3.0.0 version.

For 2.0.0 we drop func as dependency. Because it archived and doesn't support dart2.

If you need dart-1.24.3 use 1.4.0 version

Examples

memo1, memo2, ... memo10 compare arguments with == operator:

import 'dart:math';
import 'package:memoize/memoize.dart';

void main() {
  var rect1 = new Rectangle<int>(0, 0, 10, 10);
  var rect2 = new Rectangle<int>(0, 0, 10, 10);

  var func = memo1((Rectangle<int> a) => a.width * a.height);

  print(func(rect1));
  print(func(rect2)); // cached result is returned
}

imemo1, imemo2, ... imemo10 compare arguments with identical function:

import 'dart:math';
import 'package:memoize/memoize.dart';

void main() {
  var rect1 = new Rectangle<int>(0, 0, 10, 10);
  var rect2 = new Rectangle<int>(0, 0, 10, 10);

  var func = imemo1((Rectangle<int> a) => a.width * a.height);

  print(func(rect1));
  print(func(rect1)); // cached - same object instance
  print(func(rect2)); // not cached - different object instance
}

memo0 caches result on first call and can be used as lazy cache:

import 'dart:math';
import 'package:memoize/memoize.dart';

void main() {
  var func = memo0(() => new Rectangle<int>(0, 0, 10, 10));

  print(func());
  print(func()); // cached - same object instance
}

Contributors

• Brian Egan