Dart extended feature

Dart Extended features

summary

Generally, a class should be extended , You need to inherit this class , stay dart 2.7 in the future , introduce extension, Used to extend the methods of the class .

Use

extension StringToNumber on String {
    int toInt() {
        return int.parse(this);
    }
}

extension NumberOperator on int {
    int add(int other) {
        return this + other;
    }
}

int result = "18".toInt();

int sum = 1.add(2);

API Conflict

Mode one

Use show or hide Restricted use .

import 'extension1.dart' hide StringToNumber, NumberOperator;
import 'extension2.dart';

Mode two

rename .

import 'extention1.dart';
import 'extention2.dart' as ext2;