locutus/esm/golang/strings/Count.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

export function Count(s, sep) {
    //      discuss at: https://locutus.io/golang/strings/Count
    // parity verified: Go 1.23
    //     original by: Kevin van Zonneveld (https://kvz.io)
    //        input by: GopherJS (https://www.gopherjs.org/)
    //       example 1: Count("cheese", "e")
    //       returns 1: 3
    //       example 2: Count("five", "") // before & after each rune
    //       returns 2: 5
    let pos;
    let n = 0;
    if (sep.length === 0) {
        return s.split(sep).length + 1;
    }
    else if (sep.length > s.length) {
        return 0;
    }
    else if (sep.length === s.length) {
        if (sep === s) {
            return 1;
        }
        return 0;
    }
    while (true) {
        pos = (s + '').indexOf(sep);
        if (pos === -1) {
            break;
        }
        n = (n + 1) >> 0;
        s = s.substring((pos + sep.length) >> 0);
    }
    return n;
}