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Counts the occurrences of a substring in a given string.
- Use
Array.prototype.indexOf()to look forsearchValueinstr. - Increment a counter if the value is found and update the index,
i. - Use a
whileloop that will return as soon as the value returned fromArray.prototype.indexOf()is-1.
const countSubstrings = (str, searchValue) => {
let count = 0,
i = 0;
while (true) {
const r = str.indexOf(searchValue, i);
if (r !== -1) [count, i] = [count + 1, r + 1];
else return count;
}
};countSubstrings('tiktok tok tok tik tok tik', 'tik'); // 3
countSubstrings('tutut tut tut', 'tut'); // 4Recommended snippets
Index of substrings
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Finds all the indexes of a substring in a given string.
Left substring generator
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Generates all left substrings of a given string.
Right substring generator
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Generates all right substrings of a given string.