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Added max character algorithm #432

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Merged
pomkarnath98 merged 2 commits into from
Oct 11, 2020
Merged

Added max character algorithm #432

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7dfcfef
Merge pull request #1 from TheAlgorithms/master
josecarlosweb Oct 7, 2020
c751788
Added new algoritm
josecarlosweb Oct 7, 2020
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29 changes: 29 additions & 0 deletions String/MaxCharacter.js
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Original file line number Diff line number Diff line change
@@ -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 }
12 changes: 12 additions & 0 deletions String/MaxCharacter.test.js
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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')
})
})