Solve Event puzzler with tests

.gitignore

@@ -1,4 +1,5 @@
 node_modules
 dist
 npm-debug.log
-coverage
+coverage
+.prettierrc.yaml

src/index.test.ts

@@ -1,7 +1,55 @@
-//write tests here
+import { testSeed1, testSeed2, testSeed2Expected, testSeed3, testSeed3Expected } from './mockTestData'
+import { IEvent, eventStream, assignPointValue, assignRegionScore } from '../src/index'
 
-describe('Tests will go here!', () => {
-  it('should pass', () => {
-    expect(true).toBeTruthy()
+describe('event puzzler solution', () => {
+
+  describe('eventStream()', () => {
+
+    it('return the given stream if there are 5 events or less', () => {
+      const actual: ReadonlyArray<IEvent> = eventStream(testSeed1)
+      expect(actual).toEqual(testSeed1)
+    })
+
+    it('returns the region with with the highest cumulative point value from the input', () => {
+      const actual: ReadonlyArray<IEvent> = eventStream(testSeed2)
+      const expected: ReadonlyArray<IEvent> = testSeed2Expected
+      expect(actual).toEqual(expected)
+    })
+
+    it('should return first region in stream when cumlative point value ties another region', () => {
+      const actual: ReadonlyArray<IEvent> = eventStream(testSeed3)
+      const expected: ReadonlyArray<IEvent> = testSeed3Expected
+      expect(actual).toEqual(expected)
+    })
+  })
+
+  describe('assignpointValue()', () => {
+
+    it('return 1 if passed "newMessage"', () => {
+      const actual: number = assignPointValue('newMessage')
+      expect(actual).toEqual(1)
+    })
+
+    it('return 2 if passed "view"', () => {
+      const actual: number = assignPointValue('view')
+      expect(actual).toEqual(2)
+    })
+
+    it('return 3 if passed "screenShot"', () => {
+      const actual: number = assignPointValue('screenShot')
+      expect(actual).toEqual(3)
+    })
+  })
+
+  describe('assignRegionScore()', () => {
+    it('should return the cumlative value of eventType starting at index for regionLegnth given', () => {
+      const actual: number = assignRegionScore(testSeed2, 1, 5)
+      expect(actual).toEqual(9)
+    })
+
+    it('should only count to the end of the array', () => {
+      const actual: number = assignRegionScore(testSeed2, 1, 50)
+      expect(actual).toEqual(16)
+    })
   })
-})
+})

src/index.ts

@@ -1 +1,38 @@
-//Define class/functions here
+export interface IEvent {
+  readonly timestamp: number
+  readonly eventType: EventType
+}
+export type EventType = 'newMessage' | 'screenShot' | 'view'
+
+export function eventStream(
+  stream: IEvent[],
+  regionLength: number = 5
+): ReadonlyArray<IEvent> {
+  if (stream.length <= regionLength) return stream
+
+  const regionValues: number[] = [...stream].map((next, index, stream) =>
+    assignRegionScore(stream, index, regionLength)
+  )
+  const index = regionValues.indexOf(Math.max(...regionValues))
+  const region = [...stream].splice(index, regionLength)
+  return region
+}
+
+export function assignPointValue(eventType: EventType): Readonly<number> {
+  switch (eventType) {
+    case 'newMessage':
+      return 1
+    case 'view':
+      return 2
+    case 'screenShot':
+      return 3
+    default:
+      throw new Error('Not a valid eventType')
+  }
+}
+
+export function assignRegionScore(stream: IEvent[], index: number, regionLength: number): number {
+  const region = [...stream].splice(index, regionLength)
+  const regionScore = region.reduce((acc, event) => (acc + assignPointValue(event.eventType)), 0)
+  return regionScore
+}

src/mockTestData.ts

@@ -0,0 +1,201 @@
+import { IEvent } from '../src/index'
+
+export const testSeed1: Array<IEvent> = [
+  {
+    timestamp: 123123123,
+    eventType: 'newMessage',
+  },
+  {
+    timestamp: 123123124,
+    eventType: 'newMessage',
+  },
+  {
+    timestamp: 123123125,
+    eventType: 'newMessage',
+  },
+  {
+    timestamp: 123123125,
+    eventType: 'view',
+  },
+]
+
+export const testSeed2: Array<IEvent> = [
+  {
+    timestamp: 123123123,
+    eventType: 'newMessage',
+  },
+  {
+    timestamp: 123123124,
+    eventType: 'newMessage',
+  },
+  {
+    timestamp: 123123125,
+    eventType: 'newMessage',
+  },
+  {
+    timestamp: 123123125,
+    eventType: 'view',
+  },
+  {
+    timestamp: 123123125,
+    eventType: 'view',
+  },
+  {
+    timestamp: 123123125,
+    eventType: 'screenShot',
+  },
+  {
+    timestamp: 123123125,
+    eventType: 'screenShot',
+  },
+  {
+    timestamp: 123123125,
+    eventType: 'newMessage',
+  },
+  {
+    timestamp: 123123125,
+    eventType: 'screenShot',
+  },
+]
+
+export const testSeed2Expected: Array<IEvent> = [
+  {
+    timestamp: 123123125,
+    eventType: 'view',
+  },
+  {
+    timestamp: 123123125,
+    eventType: 'screenShot',
+  },
+  {
+    timestamp: 123123125,
+    eventType: 'screenShot',
+  },
+  {
+    timestamp: 123123125,
+    eventType: 'newMessage',
+  },
+  {
+    timestamp: 123123125,
+    eventType: 'screenShot',
+  },
+]
+
+export const testSeed3: Array<IEvent> = [
+  {
+    timestamp: 123123123,
+    eventType: 'newMessage',
+  },
+  {
+    timestamp: 123123124,
+    eventType: 'newMessage',
+  },
+  {
+    timestamp: 123123125,
+    eventType: 'newMessage',
+  },
+  {
+    timestamp: 123123125,
+    eventType: 'view',
+  },
+  {
+    timestamp: 123123125,
+    eventType: 'view',
+  },
+  {
+    timestamp: 4587456,
+    eventType: 'newMessage',
+  },
+  {
+    timestamp: 46464,
+    eventType: 'newMessage',
+  },
+  {
+    timestamp: 46463125,
+    eventType: 'newMessage',
+  },
+  {
+    timestamp: 464625,
+    eventType: 'view',
+  },
+  {
+    timestamp: 464625,
+    eventType: 'view',
+  },
+]
+
+export const testSeed3Expected: Array<IEvent> = [
+  {
+    timestamp: 123123123,
+    eventType: 'newMessage',
+  },
+  {
+    timestamp: 123123124,
+    eventType: 'newMessage',
+  },
+  {
+    timestamp: 123123125,
+    eventType: 'newMessage',
+  },
+  {
+    timestamp: 123123125,
+    eventType: 'view',
+  },
+  {
+    timestamp: 123123125,
+    eventType: 'view',
+  },
+]
+
+// export const testSeed4: Array<IEvent> = [
+//   {
+//     timestamp: 123123123,
+//     eventType: 'newMessage',
+//     value: 1,
+//   },
+//   {
+//     timestamp: 123123124,
+//     eventType: 'newMessage',
+//     value: 1,
+//   },
+//   {
+//     timestamp: 123123125,
+//     eventType: 'newMessage',
+//     value: 1,
+//   },
+//   {
+//     timestamp: 123123125,
+//     eventType: 'view',
+//     value: 2,
+//   },
+//   {
+//     timestamp: 123123125,
+//     eventType: 'view',
+//     value: 2,
+//   },
+//   {
+//     timestamp: 4587456,
+//     eventType: 'newMessage',
+//     value: 1,
+//   },
+//   {
+//     timestamp: 46464,
+//     eventType: 'newMessage',
+//     value: 1,
+//   },
+//   {
+//     timestamp: 46463125,
+//     eventType: 'newMessage',
+//     value: 1,
+//   },
+//   {
+//     timestamp: 464625,
+//     eventType: 'view',
+//     value: 2,
+//   },
+//   {
+//     timestamp: 464625,
+//     eventType: 'view',
+//     value: 2,
+//   },
+// ]