example/example.md
📝 Examples #

import 'package:flutter/material.dart';
import 'package:supercharged/supercharged.dart';

main() {
  // Transform any String to colors
  "#ff00ff".toColor(); // painless hex to color
  "red".toColor(); // supports all web color names

  // Helpful substring functions:
  "mode:production".allAfter(":"); // "production"
  "<html>".allBetween("<", ">"); // "html"`
  "flutter is cool".allBefore(" is"); // "flutter"

  // Handle user input:
  "2.1".toDouble(); // 2.1
  "42".toInt(); // 42
  12.isBetween(0, 30); // true

  // Effortless aggregation for Iterable<int> and Iterable<double>:
  [1, 2, 3].sum(); // 6
  [1, 2, 3].average(); // 2
  [1, 2, 3].min(); // 1
  [1, 2, 3].max(); // 3

  // Advanced aggregation for any Iterable:
  var persons = [Person(age: 20), Person(age: 30), Person(age: 40)];
  persons.sumBy((p) => p.age); // 90
  persons.averageBy((p) => p.age); // 30
  persons.count((p) => p.age < 35); // 2
  persons.minBy((a, b) => a.age.compareTo(b.age)); // Person(age: 20)
  persons.maxBy((a, b) => a.age.compareTo(b.age)); // Person(age: 40)

  // Safely access Iterable:
  [].firstOrNull(); // return null instead
  [].lastOrNull(); // of throwing error

  [].firstOrElse(() => Placeholder()); // Produce default values
  [].lastOrElse(() => Placeholder()); // on the fly

  [1, 2, 3].elementAtOrNull(4); // Never go out of bounds
  [1, 2, 3].elementAtOrElse(4, () => 0);

  // Group up data to match view:
  persons = [
    Person(name: "John", age: 21),
    Person(name: "Carl", age: 18),
    Person(name: "Peter", age: 56),
    Person(name: "Sarah", age: 61)
  ];

  persons.groupBy((p) => p.age < 40 ? "young" : "old",
      valueTransform: (p) =>
          p.name); // {"young": ["John", "Carl"], "old": ["Peter", "Sarah"]}

  // Chunking for easy pagination:
  ["a", "b", "c", "d", "e"].chunked(3); // [ ["a", "b", "c"], ["d", "e"] ]
  ["a", "b", "c"].chunked(2, fill: () => ""); // [ ["a", "b"], ["c", ""] ]

  // More natural durations and dates:
  var duration = 5.minutes + 30.seconds;
  duration += 0.5.hours;

  var future = 2.days.fromNow() + 20.minutes;
  var past = 15.minutes.ago();

  var allDaysOf2020 = DateTime(2020).until(DateTime(2021));
  var allFullHoursOfFirstJanuary2020 =
      DateTime(2020, 1, 1).until(DateTime(2020, 1, 2), by: 1.hours);

  // Simplified data sorting:
  persons = [
    Person(name: "John", age: 21),
    Person(name: "Carl", age: 18),
    Person(name: "Peter", age: 56),
    Person(name: "Sarah", age: 61)
  ];

  persons.sortedByNum((p) => p.age); // list sorted by age
  persons.sortedByString((p) => p.name); // list sorted by name
  persons
      .sortedBy((a, b) => a.name.compareTo(b.name)); // sorted with comparator

  persons // sorting is fully integrated into processing chain
      .filter((p) => p.name.length < 5)
      .sortedByNum((p) => p.age)
      .map((p) => p.name)
      .toList();

  // Solid tween shortcuts for animations
  100.0.tweenTo(200.0); // Tween(begin: 100.0, end: 200.0)
  Colors.red.tweenTo(Colors.blue); // ColorTween(...)

  // Replace your classic for loop:
  0.rangeTo(5); // [0, 1, 2, 3, 4, 5]
  3.rangeTo(1); // [3, 2, 1]

  var list = ["dog", "cat", "mouse"];
  0.until(list.length); // [0, 1, 2]

  list.forEachIndexed((index, value) {
    // index: 0, value: "dog"
    // index: 1, value: "cat"
    // index: 2, value: "mouse"
  });
}

class Person {
  final String name;
  final int age;

  Person({this.age, this.name = ""});
}

class Placeholder {}
supercharged 1.8.2
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