bowling challenge

frame.js

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+class Frame {
+    // rest parameter syntax allows a function to accept an indefinite number of arguments as an array
+    //  rest parameter(...args) will be an array
+    constructor (...scores){
+        this.frame = scores;
+    }
+
+    getFrame(){
+        return this.frame
+    }
+
+    sumFrame(){
+        // reduce() : return the sum of all the elements in an array
+        //  reducer walks through the array element-by-element, 
+        // at each step adding the current array value to the 
+        // result from the previous step
+        return this.frame.reduce((sum, value) => sum + value, 0 )
+    }
+
+    isSpare(){
+        // The ! operator: check for the negation of a boolean value.
+        //  (!this.isStrike())= (this.isStrike() != true)
+        return this.sumFrame() === 10 && !this.isStrike();
+    }
+
+    isStrike(){
+        return this.frame[0] === 10;
+    }
+}
+
+module.exports = Frame; 

frame.test.js

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+const Frame = require('./frame');
+
+
+describe('Frame', () => {
+  describe('the first frame with two zero rolls', () => {
+    it('initialises with zero', () => {
+        const frame1 = new Frame(0,0);
+        expect(frame1.getFrame()).toEqual([0,0]);
+    });
+
+    it('sum of the initialised frame', () => {
+        const frame1 = new Frame(0,0);
+        expect(frame1.sumFrame()).toEqual(0);
+    }) 
+
+    it('frame is not a strike', () => {
+        const frame1 = new Frame(0, 0);
+        expect(frame1.isStrike()).toEqual(false);
+      })
+
+    it('frame is not a spare', () => {
+        const frame1 = new Frame(0, 0);
+        expect(frame1.isSpare()).toEqual(false);
+    });
+});
+
+describe('frame with two rolls upto 9', () => {
+    it('its array', () => {
+        const frame1 = new Frame(1,5);
+        expect(frame1.getFrame()).toEqual([1,5]);
+    });
+
+    it('sum of the frame', () => {
+        const frame1 = new Frame(1,5);
+        expect(frame1.sumFrame()).toEqual(6);
+    }) 
+
+    it('frame is not a strike', () => {
+        const frame1 = new Frame(1, 5);
+        expect(frame1.isStrike()).toEqual(false);
+      })
+
+    it('frame is not a spare', () => {
+        const frame1 = new Frame(1, 5);
+        expect(frame1.isSpare()).toEqual(false);
+    });
+  });
+
+  describe('when the frame is a spare', () => {
+    it('its array', () => {
+        const frame1 = new Frame(5,5);
+        expect(frame1.getFrame()).toEqual([5,5]);
+    });
+
+    it('sum of the frame', () => {
+        const frame1 = new Frame(5,5);
+        expect(frame1.sumFrame()).toEqual(10);
+    }) 
+
+    it('frame is not a strike', () => {
+        const frame1 = new Frame(5, 5);
+        expect(frame1.isStrike()).toEqual(false);
+      })
+
+    it('frame is  a spare', () => {
+        const frame1 = new Frame(5, 5);
+        expect(frame1.isSpare()).toEqual(true);
+    });
+  });
+
+  describe('when the frame is a strike', () => {
+    it('its array', () => {
+        const frame1 = new Frame(10);
+        expect(frame1.getFrame()).toEqual([10]);
+    });
+
+    it('sum of the frame', () => {
+        const frame1 = new Frame(10);
+        expect(frame1.sumFrame()).toEqual(10);
+    }) 
+
+    it('frame is a strike', () => {
+        const frame1 = new Frame(10);
+        expect(frame1.isStrike()).toEqual(true);
+      })
+
+    it('frame is not a spare', () => {
+        const frame1 = new Frame(10);
+        expect(frame1.isSpare()).toEqual(false);
+    });
+  });
+
+});

frameindex.js

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+const Frame = require('./frame');
+
+const frame = new Frame(5,2)
+
+console.log(frame.getFrame());
+console.log(frame.sumFrame());
+console.log(frame.isSpare());
+console.log(frame.isStrike());

index.js

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+const Scorecard = require('./scorecard');
+
+const scorecard = new Scorecard();
+    scorecard.addFrame(1, 2);
+    scorecard.addFrame(10, 0);
+    scorecard.addFrame(5, 5);
+    scorecard.addFrame(1, 2);
+console.log(scorecard.getFrameArray());
+
+console.log(scorecard.totalScores());