merge: reduce upper & lower & add export default (TheAlgorithms#960)

Author: fahimfaisaal

String/Lower.js

@@ -12,12 +12,9 @@ const lower = (str) => {
  throw new TypeError('Invalid Input Type')
  }
 
- return str
- .replace(/[A-Z]/g, (_, indexOfUpperChar) => {
- const asciiCode = str.charCodeAt(indexOfUpperChar)
-
- return String.fromCharCode(asciiCode + 32)
- })
+ return str.replace(
+ /[A-Z]/g, (char) => String.fromCharCode(char.charCodeAt() + 32)
+ )
 }
 
-export { lower }
+export default lower

String/Upper.js

@@ -12,13 +12,8 @@ const upper = (str) => {
  }
 
  return str.replace(
- /[a-z]/g,
- (_, indexOfLowerChar) => {
- const asciiCode = str.charCodeAt(indexOfLowerChar)
-
- return String.fromCharCode(asciiCode - 32)
- }
+ /[a-z]/g, (char) => String.fromCharCode(char.charCodeAt() - 32)
  )
 }
 
-export { upper }
+export default upper

String/test/Lower.test.js

@@ -1,4 +1,4 @@
-import { lower } from '../Lower'
+import lower from '../Lower'
 
 describe('Testing the Lower function', () => {
  it('Test 1: Check by invalid type', () => {

String/test/Upper.test.js

@@ -1,6 +1,6 @@
-import { upper } from '../Upper'
+import upper from '../Upper'
 
-describe('Upper', () => {
+describe('Testing the Upper function', () => {
  it('return uppercase strings', () => {
  expect(upper('hello')).toBe('HELLO')
  expect(upper('WORLD')).toBe('WORLD')