- refactor defaultComparator to be a common function

Author: Isaac Ramirez

src/algorithms/selection-sort/selection-sort.js

@@ -1,18 +1,5 @@
 const { StdOut } = require('../../libs')
-
-/**
- * A default comparing function that
- * returns -1 when `a` is less than `b`,
- * returns 1 when `a` is greater than `b` or
- * returns 0 when `a` is equal to `b`.
- * @param {*} a Comparable object `a`
- * @param {*} b Comparable object `b`
- */
-const defaultComparator = (a, b) => {
-  if (a === b) return 0
-
-  return a < b ? -1 : 1
-}
+const { defaultComparator } = require('../../common')
 
 /**
  * Selection

src/algorithms/selection-sort/selection-sort.spec.js

@@ -1,12 +1,7 @@
 const Selection = require('./selection-sort')
 const { newArrayOf } = require('../../utils')
 const { StdRandom } = require('../../libs')
-
-const comparator = (a, b) => {
-  if (a < b) return -1
-  else if (a > b) return 1
-  return 0
-}
+const { defaultComparator: comparator } = require('../../common')
 
 describe('Unit Tests: Selection Sort Algorithm', () => {
   beforeEach(() => {

src/common/comparators.common.js

@@ -0,0 +1,17 @@
+/**
+ * A default comparing function that
+ * returns -1 when `a` is less than `b`,
+ * returns 1 when `a` is greater than `b` or
+ * returns 0 when `a` is equal to `b`.
+ * @param {*} a Comparable object `a`
+ * @param {*} b Comparable object `b`
+ */
+const defaultComparator = (a, b) => {
+  if (a === b) return 0
+
+  return a < b ? -1 : 1
+}
+
+module.exports = {
+  defaultComparator
+}

src/common/index.js

@@ -0,0 +1,3 @@
+module.exports = {
+  ...require('./comparators.common')
+}