switchcontext.ts

class SwitchContext {
    private Cases: { Match: any, Handler: () => void, IsDefault?: boolean }[] = [];

    addCase(match: any, handler: () => void): void {
        this.Cases.push({ Match: match, Handler: handler });
    }

    addDefault(handler: () => void): void {
        this.Cases.push({ Match: null, Handler: handler, IsDefault: true });
    }

    execute(value: any): void {
        let matched = false;
        for (let cb of this.Cases) {
            if (cb.Match === value || cb.Match == value) {
                cb.Handler();
                matched = true;
                break;
            }
        }
        if (!matched) {
            let defaultCase = this.Cases.find(cb => cb.IsDefault);
            if (defaultCase) defaultCase.Handler();
        }
        this.Cases = []; // clear after execution
    }
}