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indexOfSubstrings javascript Code Snippet in 2022

stringalgorithmgeneratorintermediate

Last Updated: 25 September 2022

Finds all the indexes of a substring in a given string.

  • Use Array.prototype.indexOf() to look for searchValue in str.
  • Use yield to return the index if the value is found and update the index, i.
  • Use a while loop that will terminate the generator as soon as the value returned from Array.prototype.indexOf() is -1.
const indexOfSubstrings = function* (str, searchValue) { let i = 0; while (true) { const r = str.indexOf(searchValue, i); if (r !== -1) { yield r; i = r + 1; } else return; } };
[...indexOfSubstrings('tiktok tok tok tik tok tik', 'tik')]; // [0, 15, 23] [...indexOfSubstrings('tutut tut tut', 'tut')]; // [0, 2, 6, 10] [...indexOfSubstrings('hello', 'hi')]; // []

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