78 lines
1.2 KiB
Dart
78 lines
1.2 KiB
Dart
import 'dart:convert';
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import 'package:cubetiq/interfaces.dart';
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void main(List<String> args) {
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MyCart.addCart(
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Cart(1, 'Apple', 1),
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);
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MyCart.show();
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MyCart.addCart(
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Cart(1, 'Apple', 2),
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);
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MyCart.show();
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MyCart.inc(1, qty: 2);
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MyCart.show();
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MyCart.dec(1, qty: 4);
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MyCart.show();
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}
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class Cart implements ToJson {
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final int id;
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final String name;
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double qty;
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Cart(this.id, this.name, this.qty);
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@override
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Map toJson() {
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return {
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'id': id,
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'name': name,
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'qty': qty,
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};
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}
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}
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class MyCart {
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static final Map<int, Cart> carts = {};
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static void inc(int id, {double qty = 1}) {
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if (carts.containsKey(id)) {
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carts[id]!.qty += qty;
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}
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}
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static void dec(int id, {double qty = 1}) {
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if (carts.containsKey(id)) {
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carts[id]!.qty -= qty;
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}
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}
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static void addCart(Cart cart) {
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if (carts.containsKey(cart.id)) {
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carts[cart.id]!.qty += cart.qty;
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} else {
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carts[cart.id] = cart;
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}
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}
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static void removeCart(Cart cart) {
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if (carts.containsKey(cart.id)) {
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carts.remove(cart.id);
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}
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}
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static void show() {
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var data = carts.map((key, value) => MapEntry(key, jsonEncode(value)));
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print('$data');
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}
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}
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