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Superpowers for Dart. Collection of useful static extension methods.

Gits Extension #

Fork and modify from dartx and export package time.

Scope Functions #

.run #

Calls the specified function [block] with [it] value as its receiver and returns its result.

String? getValue() => '1';
final value = getValue();

value?.run((it) => doSomething(it));

.let #

Calls the specified function [block] with [it] value as its argument and returns its result.

String? getValue() => '1';
final value = getValue();
final let = value?.let((it) => int.parse(it)); // 1 (int)

.also #

Calls the specified function [block] with [it] value as its argument and returns block value.

String? getValue() => '1';
final value = getValue();
int itValue = 0;
final also = value?.also((it) {
    itValue = int.parse(it);
});

print(also);        // 1 (String)
print(itValue);     // 1 (int)

.takeIf #

Returns [T] value if it satisfies the given [predicate] or null, if it doesn't.

final a = 10.takeIf((it) => it % 2 == 0); // 10
final b = 9.takeIf((it) => it % 2 == 0); // null

.takeUnless #

Returns [T] value if it does not satisfy the given [predicate] or null, if it does.

final value = 10.takeUnless((it) => it % 2 == 0); // null
final value = 9.takeUnless((it) => it % 2 == 0); // 9

int #

.plus #

Return int this plus with [value].

final a = 1.plus(1);  // 2
final b = 200.plus(50);  // 250

.minus #

Return int this minus with [value].

final a = 1.minus(1);  // 0
final b = 200.minus(50);  // 150

.ordinal #

Returns an ordinal number of String type for any integer

final a = 1.ordinal();  // 1st
final b = 108.ordinal();  // 108th

double #

.plus #

Return double this plus with [value].

final a = 1.0.plus(1.5);  // 2.5
final b = 200.5.plus(50.5);  // 251.0

.minus #

Return double this minus with [value].

final a = 1.5.minus(1.0);  // 0.5
final b = 200.5.minus(50.5);  // 150

String #

.isEmail #

Return boolean checks whether the String is a valid email.

final isEmail = 'example@gmail.com'.isEmail; // true
final isNotEmail = 'example@'.isEmail; // false

.capitalize #

Returns a copy of the string having its first letter uppercased, or the original string, if it's empty or already starts with an upper case letter.

final word = 'abcd'.capitalize(); // Abcd
final anotherWord = 'Abcd'.capitalize(); // Abcd

.decapitalize #

Returns a copy of the string having its first letter lowercased, or the original string, if it's empty or already starts with a lower case letter.

final word = 'abcd'.decapitalize(); // abcd
final anotherWord = 'Abcd'.decapitalize(); // abcd

.isBlank #

Returns true if this string is empty or consists solely of whitespace characters.

final notBlank = '   .'.isBlank; // false
final blank = '  '.isBlank; // true

.isDouble #

Returns true if the string can be parsed as a double.

final a = ''.isDouble; // false
final b = 'a'.isDouble; // false
final c = '1'.isDouble; // true
final d = '1.0'.isDouble; // true
final e = '123456789.987654321'.isDouble; // true
final f = '1,000'.isDouble; // false

.isInt #

Returns true if the string can be parsed as an integer.

final a = ''.isInt; // false
final b = 'a'.isInt; // false
final c = '1'.isInt; // true
final d = '1.0'.isInt; // false
final e = '1,000'.isInt; // false

.isLowerCase #

Returns true if the entire string is lower case.

final a = 'abc'.isLowerCase; // true
final b = 'abC'.isLowerCase; // false
final c = '   '.isLowerCase; // true
final d = ''.isLowerCase; // false

.isNotBlank #

Returns true if this string is not empty and contains characters except whitespace characters.

final blank = '  '.isNotBlank; // false
final notBlank = '   .'.isNotBlank; // true

.isNullOrEmpty #

Returns true if the String is either null or empty.

final isNull = null.isNullOrEmpty; // true
final isEmpty = ''.isNullOrEmpty; // true
final isBlank = ' '.isNullOrEmpty; // false
final isLineBreak = '\n'.isNullOrEmpty; // false

.isNotNullOrEmpty #

Returns true if the String is neither null nor empty.

final isNull = null.isNullOrEmpty; // true
final isEmpty = ''.isNullOrEmpty; // true
final isBlank = ' '.isNullOrEmpty; // false
final isLineBreak = '\n'.isNullOrEmpty; // false

.isNullOrBlank #

Returns true if the String is either null or blank.

final isNull = null.isNullOrBlank; // true
final isEmpty = ''.isNullOrBlank; // true
final isBlank = ' '.isNullOrBlank; // true
final isLineBreak = '\n'.isNullOrBlank; // true
final isFoo = ' foo '.isNullOrBlank; // false

.isNotNullOrBlank #

Returns true if the String is neither null nor blank.

final isNull = null.isNullOrBlank; // true
final isEmpty = ''.isNullOrBlank; // true
final isBlank = ' '.isNullOrBlank; // true
final isLineBreak = '\n'.isNullOrBlank; // true
final isFoo = ' foo '.isNullOrBlank; // true

.isUpperCase #

Returns true if the entire string is upper case.

final a = 'ABC'.isUpperCase; // true
final b = 'ABc'.isUpperCase; // false
final c = '   '.isUpperCase; // true
final d = ''.isUpperCase; // false

.urlEncode #

Translates a string into application/x-www-form-urlencoded format using a specific encoding scheme.

const originalUrl = 'Hello Ladies + Gentlemen, a signed OAuth request!';
final encodedUrl = originalUrl.urlEncode;
// 'Hello%20Ladies%20+%20Gentlemen,%20a%20signed%20OAuth%20request!'

.urlDecode #

Decodes an application/x-www-form-urlencoded string using a specific encoding scheme.

const encodedUrl = 'Hello%20Ladies%20+%20Gentlemen,%20a%20signed%20OAuth%20request!';
final decodedUrl = encodingUrl.urlDecode;
// 'Hello Ladies + Gentlemen, a signed OAuth request!'

.slice() #

Returns a new substring containing all characters including indices [start] and [end]. If [end] is omitted, it is being set to lastIndex.

final sliceOne = 'awesomeString'.slice(0,6)); // awesome
final sliceTwo = 'awesomeString'.slice(7)); // String

.toDoubleOrNull() #

Parses the string as a double and returns the result or null if the String is not a valid representation of a number.

final numOne = '1'.toDoubleOrNull(); // 1.0
final numTwo = '1.2'.toDoubleOrNull(); // 1.2
final blank = ''.toDoubleOrNull(); // null

.toInt() #

Parses the string as an integer and returns the result. The radix (base) thereby defaults to 10. Throws a FormatException if parsing fails.

final a = '1'.toInt(); // 1
final b = '100'.toInt(radix: 2); // 4
final c = '100'.toInt(radix: 16); // 256
final d = '1.0'.toInt(); // throws FormatException

.toIntOrNull() #

Parses the string as an integer or returns null if it is not a number.

final number = '12345'.toIntOrNull(); // 12345
final notANumber = '123-45'.toIntOrNull(); // null

.toUtf8() #

Converts String to UTF-8 encoding.

final emptyString = ''.toUtf8(); // []
final hi = 'hi'.toUtf8(); // [104, 105]
final emoji = '😄'.toUtf8(); // [240, 159, 152, 132]

.toUtf16() #

Converts String to UTF-16 encoding.

final emptyString = ''.toUtf16(); // []
final hi = 'hi'.toUtf16(); // [104, 105]
final emoji = '😄'.toUtf16(); // [55357, 56836]

.orEmpty() #

Returns the string if it is not null, or the empty string otherwise.

String? nullableStr;
final str = nullableStr.orEmpty(); // ''

.matches() #

Returns true if this char sequence matches the given regular expression.

print('as'.matches(RegExp('^.s\$'))) // true
print('mst'.matches(RegExp('^.s\$'))) // false

Iterable Num #

.sum #

Return int this plus with [value].

final a = [50, 10, 40].sum();  // 100

.average #

Return int this plus with [value].

final a = [50, 10].average();  // 30.0

.median #

Return int this plus with [value].

final a = [1, 2, 3, 4, 5].median();  // 3
final b = [5, 4, 3, 2, 1].median();  // 3

Time utils #

Gits extension exports @jogboms great ⏰ time.dart package so you can do the following:

int secondsInADay = 1.days.inSeconds;

Duration totalTime = [12.5.seconds, 101.milliseconds, 2.5.minutes].sum();

DateTime oneWeekLater = DateTime.now() + 1.week;

Check out ⏰ time.dart for more information and examples.

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Publisher

verified publishergits.id

Superpowers for Dart. Collection of useful static extension methods.

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License

BSD-3-Clause (LICENSE)

Dependencies

flutter, time

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