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MaxWord.js

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// Given a sentence, return the most occurring word

/**

* @param {string} sentence - the sentence you want to find the most occurring word

* @returns {string} - the most occurring word

*

* @example

* - maxWord('lala lili lala'); // lala

*/

const maxWord = (sentence = '') => {

if (typeof sentence !== 'string') {

throw new TypeError('the param should be string')

}

if (!sentence) {

return null

}

const words = sentence.split(' ')

if (words.length < 2) {

return words[0]

}

const occurrences = {}

words.forEach(word => {

occurrences[word.toLocaleLowerCase()] = occurrences[word.toLocaleLowerCase()] + 1 || 1

})

const max = Object.keys(occurrences).reduce((n, word) => {

if (occurrences[word] > n.count) { return { word, count: occurrences[word] } } else { return n }

}, { word: '', count: 0 })

return max.word

}

export { maxWord }