hanrattyjen / bowling_js

Makers Academy bowling scorecard solution with Jasmine

bowling_js

Makers Academy bowling scorecard solution with Jasmine

A note on the tests

I've tried to give an example of using tests to fully specify the solution.

Run SpecRunner.html and read the output to see the extent of the solution. I don't warrant that every eventuality is covered, but the obvious paths are.

A note on the solution

The solution uses a linked-list-style approach, with each frame having a reference to the next frame, which it uses to calculate its own score (in the case of a strike or spare).

The game can then walk this list (starting at the first frame) to calculate the total score.

Note how bowl() methods return this to allow chaining. This is provided merely as a convenience, but makes for a nice interface.

A note on FinalFrame

FinalFrame uses a 'classical' inheritance pattern - i.e. it's aim is to construct objects whose prototype inherits the prototype of Frame and whose constructor also calls the Frame constructor.

This is achieved by overwriting the FinalFrame function's prototype with a new object derived from the Frame prototype:

FinalFrame.prototype = Object.create(Frame.prototype);

However, this means FinalFrame's prototype (the new object just created above) now inherits its constructor property from the prototype of Frame; which returns Frame, which we don't want, so we overwrite the property:

FinalFrame.prototype.constructor = FinalFrame;

Finally, we call Frame from FinalFrame to ensure new objects are correctly initialized:

function FinalFrame() {
  Frame.call(this);
};