useful_extensions 0.0.1
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Package of useful extensions.

About this package #

This package contains extensions that you may find useful in your projects. Developers familiar with the Kotlin language will find many familiar things for themselves, since the package contains many methods from this language and not only­čśŐ Flutter extensions will be added in next versions.

Contributing #

Please, consider contributing­čĹŹ

  • Add new feature
  • Fix a bug
  • Participate in discussions
  • Provide documentation
  • Create pull request

Dart #

Custom classes #

Pair #

final Pair<int, int> x = Pair(2, 2);

Bool extensions #

.not() #

if(email.isEmpty.not()){
  checkEmailIsValid(email);
}

.and() #

if(isEmailValid.and(isPasswordValid)){
  register(email, password);
}

.or() #

if(hasGoodMarks.or(hasBenefits)){
  // Action()
}

Object extensions #

Logging #

Just use indside your custom class methods

logInfo(String message, [dynamic error]);
// or
logError(String message, [dynamic error]);
// or
logDebug(String message, [dynamic error]);
// or
logWarning(String message, [dynamic error]);
// or
logWtf(String message, [dynamic error]);

Scope functions #

final String? nullableString = null;

nullableString?.let((it) {
    // Do something if string isn't null
});
final List<int> list = [1, 2, 3];

list.also((self) => print('List length ${self.length}'));

Iterable extensions #

.elementAtOrNull() #

final List<int> numbers = [1, 2, 3, 4, 5];

numbers.elementAtOrNull(numbers.length) // null

.find() #

final List<int> numbers = [1, 2, 3, 4, 5];

numbers.find((e) => e >= 3) // 3

.getRandom() #

final List<int> numbers = [1, 2, 3, 4, 5];

numbers.getRandom() // returns number from 1 to 5 

.zip() #

final List<int> firstList = [1, 2, 3];
final List<double> secondList = [1.0, 2.0, 3.0];

final List<Pair<int, double>> zipRes = firstList.zip(secondList).toList(); 

.mapIndexed() #

final List<int> firstList = [1, 2, 3, 4, 5];
final List<int> secondList = [1, 2, 3, 4, 5];

firstList.mapIndexed((index, item) => item + secondList[index]);

.filter() #

final List<Person> people = [Person('John', 14), Person('Max', 22)];

people.filter((e) => e.age > 18); // [Person('Max', 22)]

.filterNot() #

final List<Person> people = [Person('John', 14), Person('Max', 22)];

people.filterNot((e) => e.age > 18); // [Person('John', 14)]

.filterNotNull() #

final List<Person?> people = [Person('John', 14), null, Person('Max', 22)];

people.filterNotNull(); // [Person('John', 14), Person('Max', 22)]

.forEachIndexed() #

final List<int> numbers = [1, 2, 3, 4, 5];

numbers.forEachIndexed((index, item) => print(index)});

List extensions #

.plus() #

final List<int> numbers = [1, 2, 3];

numbers.plus(1); // [2, 3, 4]

.minus() #

final List<int> numbers = [1, 2, 3];

numbers.minus(1); // [0, 1, 2]

.multiply() #

final List<int> numbers = [1, 2, 3];

numbers.multiply(2); // [2, 4, 6]

.divide() #

Only available for list of doubles

final List<double> numbers = [2.0, 4.0, 3.0];

numbers.divide(2); // [1.0, 2.0, 1.5]

Full list of extensions #

Custom classes #

  • Pair

Bool extensions #

  • .not()
  • .and(other)
  • .or(other)

Object extensions #

Logging #

  • logInfo(message, [error])
  • logError(message, [error])
  • logDebug(message, [error])
  • logWarning(message, [error])
  • logWtf(message, [error])

Scope functions #

  • .let()
  • .also()

Iterable extensions #

  • .elementAtOrNull(index)
  • .find(predicate)
  • .getRandom()
  • .zip(collection)
  • .mapIndexed()
  • .forEachIndexed()
  • .filter(predicate)
  • .filterNot(predicate)
  • .filterNotNull()

List extensions #

  • .plus(number)
  • .minus(number)
  • .multiply(number)
  • .divide(number)

String extensions #

  • .isNullOrEmpty
  • .isNotBlank
  • .last
  • .isAlphabetOnly()
  • .isEmailValid([pattern])
  • .isPasswordLengthLonger()
  • .anyChar(predicate)
  • .toInt()
  • .toIntOrNull()
  • .toDouble()
  • .toDoubleOrNull()
  • .capitalizeFirst()
  • .removeAllWhiteSpace()
  • .reversed()
  • .replaceAfter(delimiter, replacement, [defaultValue])
  • .replaceBefore(delimiter, replacement, [defaultValue])

DateTime extensions #

  • .isToday
  • .isYesterday
  • .isTomorrow
  • .date
  • .isSameDay(dateTime)
  • .isAtSameYearAs(dateTime)
  • .isAtSameMonthAs(dateTime)
  • .isAtSameDayAs(dateTime)
  • .isAtSameHourAs(dateTime)
  • .isAtSameMinuteAs(dateTime)
  • .isAtSameSecondAs(dateTime)
  • .copyWith(year, month, day, hour, minute, second, millisecond, microsecond)
  • .min(dateTime)
  • .max(dateTime)
  • .differenceInDays(dateTime)
  • .differenceInHours(dateTime)
  • .differenceInMinutes(dateTime)
  • .differenceInSeconds(dateTime)