Sandbox::https://github.com/Jerad551/JavaScript/blob/master/String/CheckWordOccurrence.js

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/**

* @function checkWordOccurrence

* @description - this function count all the words in a sentence and return an word occurrence object

* @param {string} str

* @param {boolean} isCaseSensitive

* @returns {Object}

const checkWordOccurrence = (str, isCaseSensitive = false) => {

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

throw new TypeError('The first param should be a string')

}

if (typeof isCaseSensitive !== 'boolean') {

throw new TypeError('The second param should be a boolean')

}

const modifiedStr = isCaseSensitive ? str.toLowerCase() : str

return modifiedStr

.split(/\s+/) // remove all spaces and distribute all word in List

.reduce((occurrence, word) => {

occurrence[word] = occurrence[word] + 1 || 1

return occurrence

}, {})

}

export { checkWordOccurrence }