@technobuddha/library/count/count.mjs

A large library of useful functions

/**
 * Compute the number of times a substring occors within a string
 *
 * @param input The string
 * @param supstring The substring to look for
 * @param __namedParameters see {@link Options}
 * @return number of times *substring* occurs within *input*
 */
export function count(input, substring, { overlap = false } = {}) {
    const step = overlap ? 1 : substring.length;
    let cnt = 0;
    let pos = 0;
    while ((pos = input.indexOf(substring, pos)) >= 0) {
        cnt++;
        pos += step;
    }
    return cnt;
}
export default count;