merge: Remove duplicate helper functions in cache tests. (#933)

* refactor: added one implementation of fibonacciCahce

* chore: move union function

* chore: renamed the cacheTest file

Cache/test/LFUCache.test.js

@@ -1,4 +1,5 @@
 import { LFUCache } from '../LFUCache'
+import { fibonacciCache } from './cacheTest'
 
 describe('LFUCache', () => {
   it('Example 1 (Small Cache, size=2)', () => {
@@ -28,27 +29,11 @@ describe('LFUCache', () => {
 
   it('Example 2 (Computing Fibonacci Series, size=100)', () => {
     const cache = new LFUCache(100)
+
     for (let i = 1; i <= 100; i++) {
-      fib(i, cache)
+      fibonacciCache(i, cache)
     }
+
     expect(cache.cacheInfo()).toBe('CacheInfo(hits=193, misses=103, capacity=100, current size=98)')
   })
 })
-
-// Helper for building and caching Fibonacci series
-function fib (num, cache = null) {
-  if (cache) {
-    const value = cache.get(num)
-    if (value) {
-      return value
-    }
-  }
-  if (num === 1 || num === 2) {
-    return 1
-  }
-  const result = fib(num - 1, cache) + fib(num - 2, cache)
-  if (cache) {
-    cache.set(num, result)
-  }
-  return result
-}

Cache/test/LRUCache.test.js

@@ -1,4 +1,5 @@
 import { LRUCache } from '../LRUCache'
+import { fibonacciCache } from './cacheTest'
 
 describe('LRUCache', () => {
   it('Example 1 (Small Cache, size=2)', () => {
@@ -29,26 +30,8 @@ describe('LRUCache', () => {
   it('Example 2 (Computing Fibonacci Series, size=100)', () => {
     const cache = new LRUCache(100)
     for (let i = 1; i <= 100; i++) {
-      fib(i, cache)
+      fibonacciCache(i, cache)
     }
     expect(cache.cacheInfo()).toBe('CacheInfo(hits=193, misses=103, capacity=100, current size=98)')
   })
 })
-
-// Helper for building and caching Fibonacci series
-function fib (num, cache = null) {
-  if (cache) {
-    const value = cache.get(num)
-    if (value) {
-      return value
-    }
-  }
-  if (num === 1 || num === 2) {
-    return 1
-  }
-  const result = fib(num - 1, cache) + fib(num - 2, cache)
-  if (cache) {
-    cache.set(num, result)
-  }
-  return result
-}

Cache/test/Memoize.test.js

@@ -1,20 +1,10 @@
 import { memoize } from '../Memoize'
+import { union } from './cacheTest'
 import { fibonacci } from '../../Dynamic-Programming/FibonacciNumber'
 import { factorial } from '../../Recursive/Factorial'
 
 const multipleFactorials = (arr) => arr.map(factorial)
 
-/**
- * @title implementation of union function
- * @param {Set} sets
- * @return {new Set}
- */
-function union (...sets) {
-  return new Set(
-    sets.reduce((flatArray, set) => [...flatArray, ...set], [])
-  )
-}
-
 describe('Testing Memoize', () => {
   it('expects the fibonacci function to use the cache on the second call', () => {
     const memoFibonacci = memoize(fibonacci)

Cache/test/cacheTest.js

@@ -0,0 +1,37 @@
+/**
+ * @function fibonacciCache
+ * @description - this is a cached variant of fib number
+ * @param {number} n  - Real number (n > -1)
+ * @param {Object} cache
+ * @returns {number}
+ */
+export const fibonacciCache = (n, cache = null) => {
+  if (cache) {
+    const value = cache.get(n)
+
+    if (value !== null) {
+      return value
+    }
+  }
+
+  if (n === 1 || n === 2) {
+    return 1
+  }
+
+  const result = fibonacciCache(n - 1, cache) + fibonacciCache(n - 2, cache)
+
+  cache && cache.set(n, result)
+
+  return result
+}
+
+/**
+ * @title implementation of union function
+ * @param {Set} sets
+ * @return {new Set}
+ */
+export const union = (...sets) => {
+  return new Set(
+    sets.reduce((flatArray, set) => [...flatArray, ...set], [])
+  )
+}