Merge pull request #432 from josecarlosweb/feat/Add_MaxCharacter_algoritm

Added max character algorithm

Author: pomkarnath98

String/MaxCharacter.js

@@ -0,0 +1,29 @@
+/*
+ Given a string of characters, return the character that appears the most often.
+ Example: input = "Hello World!" return "l"
+*/
+const maxCharacter = (value) => {
+ if (typeof value !== 'string') {
+ throw new TypeError('The param should be a string')
+ } else if (!value) {
+ throw new Error('The param should be a valid string')
+ }
+
+ const occurrences = {}
+ for (let i = 0; i < value.length; i++) {
+ const char = value[i]
+ if (/\s/.test(char)) continue
+ occurrences[char] = occurrences[char] + 1 || 1
+ }
+ let maxCharacter = null
+ let maxCount = 0
+ Object.keys(occurrences).forEach(char => {
+ if (occurrences[char] > maxCount) {
+ maxCount = occurrences[char]
+ maxCharacter = char
+ }
+ })
+ return maxCharacter
+}
+
+export { maxCharacter }

String/MaxCharacter.test.js

@@ -0,0 +1,12 @@
+import { maxCharacter } from './MaxCharacter'
+
+describe('Testing the maxCharacter function', () => {
+ it('Expect throw with wrong arg', () => {
+ expect(() => maxCharacter(123)).toThrow()
+ })
+ it('Check the max character in string', () => {
+ const theString = 'I can\'t do that'
+ const maxChar = maxCharacter(theString)
+ expect(maxChar).toBe('t')
+ })
+})