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tshemsedinovtshemsedinov
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Add TypeScript examples
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Diff for: ‎TypeScript/1-theory.ts

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abstract class OrderState {
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protected context: TaxiOrderContext;
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constructor(context: TaxiOrderContext) {
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this.context = context;
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}
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cancel(reason: string): void {
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console.log('Action is not allowed in the current state.');
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}
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pay(amount: number): void {
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console.log('Action is not allowed in the current state.');
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}
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message(text: string): void {
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console.log('Action is not allowed in the current state.');
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}
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}
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class OrderCanceledState extends OrderState {
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cancel(reason: string): void {
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console.log('The order is already canceled.');
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}
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}
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class OrderPaidState extends OrderState {
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cancel(reason: string): void {
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console.log('Order canceled. The money will be returned.');
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}
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message(text: string): void {
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console.log('Your message has been sent.');
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}
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}
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class SearchingDriverState extends OrderState {
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cancel(reason: string): void {
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console.log('Order canceled. No driver was assigned.');
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this.context.setState(new OrderCanceledState(this.context));
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}
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pay(amount: number): void {
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console.log('You cannot pay before the car is found.');
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}
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message(text: string): void {
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console.log('You cannot message before the car is found.');
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}
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}
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class DriverAssignedState extends OrderState {
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cancel(reason: string): void {
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console.log('Order canceled. Informing the driver.');
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this.context.setState(new OrderCanceledState(this.context));
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}
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pay(amount: number): void {
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console.log(`Payment ${amount} processed. Thank you!`);
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this.context.setState(new OrderPaidState(this.context));
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}
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message(text: string): void {
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console.log('Driver assigned. Your message has been sent.');
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}
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}
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class RideInProgressState extends OrderState {
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cancel(reason: string): void {
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console.log('You cannot cancel the ride while in progress.');
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}
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}
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class RideCompletedState extends OrderState {
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cancel(reason: string): void {
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console.log('You cannot cancel the ride after completion.');
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}
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}
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class TaxiOrderContext {
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private state: OrderState;
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constructor() {
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this.state = new SearchingDriverState(this);
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}
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setState(state: OrderState): void {
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this.state = state;
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}
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cancel(reason: string): void {
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const state = Object.getPrototypeOf(this.state).constructor.name;
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console.log(`State: ${state}, Cancel: ${reason}`);
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this.state.cancel(reason);
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}
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pay(amount: number): void {
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const state = Object.getPrototypeOf(this.state).constructor.name;
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console.log(`State: ${state}, Pay: ${amount}`);
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this.state.pay(amount);
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}
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message(text: string): void {
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const state = Object.getPrototypeOf(this.state).constructor.name;
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console.log(`State: ${state}, Message: ${text}`);
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this.state.message(text);
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}
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}
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// Usage
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const order = new TaxiOrderContext();
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order.message('Hello');
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order.cancel('I changed plans');
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const newOrder = new TaxiOrderContext();
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newOrder.message('Hello');
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newOrder.setState(new DriverAssignedState(newOrder));
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newOrder.message('Waiting...');
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newOrder.cancel('No longer needed');
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const ride = new TaxiOrderContext();
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ride.setState(new RideInProgressState(ride));
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ride.message('Hello');
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ride.pay(50);
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ride.cancel('Return my money');
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ride.setState(new RideCompletedState(ride));
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ride.pay(50);
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ride.cancel('Return my money');

Diff for: ‎TypeScript/2-simple.ts

+131
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,131 @@
1+
abstract class OrderState {
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protected context: TaxiOrderContext;
3+
4+
constructor(context: TaxiOrderContext) {
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this.context = context;
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}
7+
8+
cancel(reason: string): void {
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console.log('Action is not allowed in the current state.');
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}
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pay(amount: number): void {
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console.log('Action is not allowed in the current state.');
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}
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message(text: string): void {
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console.log('Action is not allowed in the current state.');
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}
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}
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class OrderCanceledState extends OrderState {
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cancel(reason: string): void {
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console.log('The order is already canceled.');
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}
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}
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class OrderPaidState extends OrderState {
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cancel(reason: string): void {
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console.log('Order canceled. The money will be returned.');
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}
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message(text: string): void {
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console.log('Your message has been sent.');
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}
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}
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class SearchingDriverState extends OrderState {
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cancel(reason: string): void {
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console.log('Order canceled. No driver was assigned.');
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this.context.setState(OrderCanceledState);
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}
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pay(amount: number): void {
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console.log('You cannot pay before the car is found.');
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}
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message(text: string): void {
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console.log('You cannot message before the car is found.');
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}
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}
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class DriverAssignedState extends OrderState {
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cancel(reason: string): void {
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console.log('Order canceled. Informing the driver.');
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this.context.setState(OrderCanceledState);
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}
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pay(amount: number): void {
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console.log(`Payment ${amount} processed. Thank you!`);
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this.context.setState(OrderPaidState);
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}
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message(text: string): void {
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console.log('Driver assigned. Your message has been sent.');
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}
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}
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class RideInProgressState extends OrderState {
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cancel(reason: string): void {
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console.log('You cannot cancel the ride while in progress.');
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}
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}
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class RideCompletedState extends OrderState {
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cancel(reason: string): void {
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console.log('You cannot cancel the ride after completion.');
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}
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}
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type StateConstructor = new (context: TaxiOrderContext) => OrderState;
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class TaxiOrderContext {
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private state: OrderState;
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constructor() {
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this.state = new SearchingDriverState(this);
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}
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setState(StateClass: StateConstructor): void {
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this.state = new StateClass(this);
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}
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cancel(reason: string): void {
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const state = Object.getPrototypeOf(this.state).constructor.name;
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console.log(`State: ${state}, Cancel: ${reason}`);
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this.state.cancel(reason);
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}
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pay(amount: number): void {
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const state = Object.getPrototypeOf(this.state).constructor.name;
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console.log(`State: ${state}, Pay: ${amount}`);
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this.state.pay(amount);
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}
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message(text: string): void {
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const state = Object.getPrototypeOf(this.state).constructor.name;
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console.log(`State: ${state}, Message: ${text}`);
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this.state.message(text);
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}
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}
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// Usage
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const order = new TaxiOrderContext();
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order.message('Hello');
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order.cancel('I changed plans');
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const newOrder = new TaxiOrderContext();
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newOrder.message('Hello');
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newOrder.setState(DriverAssignedState);
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newOrder.message('Waiting...');
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newOrder.cancel('No longer needed');
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const ride = new TaxiOrderContext();
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ride.setState(RideInProgressState);
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ride.message('Hello');
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ride.pay(50);
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ride.cancel('Return my money');
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ride.setState(RideCompletedState);
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ride.pay(50);
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ride.cancel('Return my money');

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