// Starts the car's ignition so that it can drive.
start(): void;
// Attempt to drive a distance. Returns true or false based on whether or not the drive was successful.
drive(distance: number): boolean;
// Give the distance from the start.
getPosition(): number;
}
classCarimplementsDrivable{
private_isRunning: boolean;
private_distanceFromStart: number;
constructor(){
this._isRunning=false;
this._distanceFromStart=0;
}
/**
* Starts the car's ignition so that it can drive.
*/
publicstart(){
this._isRunning=true;
}
/**
* Attempt to drive a distance. Returns true or false based on whether or not the drive was successful.
*
* @param {number} distance The distance attempting to cover
*
* @returns {boolean} Whether or not the drive was successful
*/
publicdrive(distance: number): boolean{
if(this._isRunning){
this._distanceFromStart+=distance;
returntrue;
}
returnfalse;
}
/**
* Gives the distance from starting position
*
* @returns {number} Distance from starting position;
*/
publicgetPosition(): number{
returnthis._distanceFromStart;
}
}
// Want to experiment? Try adding a second interface: Flyable. Implement it in a Helicopter class, then write a FlyingCar class that implements both Drivable and Flyable!