[Day03] Flutter GetX equatable

目前先和大家介绍一些基本的应用大概Day15~16後会开始结合GetX
一般比较两个基本型别是否相等大多使用 "==" 两个等於的操作符,
但如果是比较两个物件是否相等,需要新增一个operator属性参考自

或者可以使用equatable
extends 原有的class 覆写props, 把要比较的属性列入list里,

import 'package:equatable/equatable.dart';

class Person extends Equatable {
  String name = "";
  String id = "";
  int age = 0;

  Person();

  @override
  List<Object> get props => [id];

  Person.fromJson(Map<String, dynamic> json) {
    name = json['name'] ?? "";
    id = json['id'] ?? "";
    age = json['age'] ?? 0;
  }

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = new Map<String, dynamic>();
    data['name'] = this.name;
    data['id'] = this.id;
    return data;
  }
}

实际要比较时import Dart原生的package:collection

  compateIfEqual() {
    final person = Person()
      ..name = "someone"
      ..id = "1"
      ..age = 5;

    final personTwo = Person()
      ..name = "sometwo"
      ..id = "2"
      ..age = 10;

    final isEqual =
        DeepCollectionEquality.unordered().equals(person, personTwo);
    print(isEqual);
  }

person 与 personTwo 不相等因为 age 5 != 10