37 lines
823 B
JavaScript
37 lines
823 B
JavaScript
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/**
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* Get the count of the longest repeating streak of `substring` in `value`.
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*
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* @param {string} value
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* Content to search in.
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* @param {string} substring
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* Substring to look for, typically one character.
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* @returns {number}
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* Count of most frequent adjacent `substring`s in `value`.
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*/
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export function longestStreak(value, substring) {
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const source = String(value)
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let index = source.indexOf(substring)
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let expected = index
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let count = 0
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let max = 0
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if (typeof substring !== 'string') {
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throw new TypeError('Expected substring')
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}
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while (index !== -1) {
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if (index === expected) {
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if (++count > max) {
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max = count
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}
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} else {
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count = 1
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}
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expected = index + substring.length
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index = source.indexOf(substring, expected)
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}
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return max
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}
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