Strategy

strategy.ts

class Context {
    private strategy: Strategy;
    constructor(strategy: Strategy) {
        this.strategy = strategy;
    }
    public setStrategy(strategy: Strategy) {
        this.strategy = strategy;
    }
    public doSomeBusinessLogic(): void {
        const result = this.strategy.printText("test")
    }
}

interface Strategy {
    printText(data: string): void;
}

class consoleStrategy implements Strategy {
    public printText(data: string): void {
        console.log(data)
    }
}

class alertStrategy implements Strategy {
    public printText(data: string): void{
        alert(data)
    }
}

const context = new Context(new consoleStrategy());
context.doSomeBusinessLogic();

context.setStrategy(new alertStrategy());
context.doSomeBusinessLogic();