objectx

Description:

objectx

The utilities extension for Dart & Flutter object.

Getting started #
dependencies:
objectx: '1.0.1+1'
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Usage #
For all extensions:
import 'package:objectx/objectx.dart';
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· let extension on T (T extends Object?) #
String foo(String a) {
return 'Value is $a';
}

String? boo() {
return null;
}

void main(){
String fooValue;
// Method 1: create a local value.
final value = boo();
if(value != null){
fooValue = foo(value);
}else{
fooValue = '';
}
// Method 2: without creating local value, but will call the boo method multi times.
fooValue = boo() != null ? foo(boo()!) : '';
// With let: the boo value is called once, let provides that value and continues to process it.
fooValue = boo()?.let(foo) ?? '';
}
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· letOrNull extension on T? (T extends Object) #
// Like let, but addition onNull function
fooValue = boo().letOrNull((it) => foo(it), onNull: () => '');
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· print extension on Object? #

print to console with tag > $tag: $object

// Method 1:
String foo(String a) {
final value = 'Value is $a';
print(Value);
return value;
}

// With objectx:
String foo(String a) {
return 'Value is $a'..print();
}
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· castTo extension on T (T extends Object?) #
class A {
const A(this.value);

final String value;
}

class B extends A {
const B(super.value, this.number);

final int number;
}

void foo(A a) {
int? value;
// Method 1:
value = a is B ? a.number : null;
// With castTo:
value = a.castTo<B?>()?.number; // returns null if can not cast a to B
}
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· firstLetter extension on String #
final String a = 'Hello World';
final first = a[0]; // 'H'
final firstLetter = a.firstLetter(); // 'HW', split by space
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· toNum extension on String #
String a = '3.14';
a.toNum();// 3.14;
a.toInt(); // null // cause int.tryParse('3.14') = null
a.toDouble(); // 3.14
a.toBool(); // null
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· limitIn extension on num #
// return value in the range [0, 1],
// if the value is smaller than 0, the minimum value returns is 0,
// and otherwise, the maximum value is 1.
final finalValue = limitIn(0, value, 1);
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· read extension on Map<K, V> #
Features and bugs #

Warning
Some extension is not work in [dynamic] type.
Please cast to [Object?] or somethings like that to use it.
See more https://dart.dev/language/extension-methods#static-types-and-dynamic

Please file feature requests and bugs at the issue tracker.