Algorithms and Data Structures implemented in JavaScript for beginners, following best practices.
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/**
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* @function countSubstrings
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* @description Given a string of words or phrases, count the occurrences of a substring
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* @param {String} str - The input string
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* @param {String} substring - The substring
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* @return {Number} - The number of substring occurrences
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* @example countSubstrings("This is a string", "is") => 2
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* @example countSubstrings("Hello", "e") => 1
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*/
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const countSubstrings = (str, substring) => {
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if (typeof str !== 'string' || typeof substring !== 'string') {
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throw new TypeError('Argument should be string')
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}
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if (substring.length === 0) return str.length + 1
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let count = 0
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let position = str.indexOf(substring)
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while (position > -1) {
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count++
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position = str.indexOf(substring, position + 1)
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}
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return count
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}
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export { countSubstrings }
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