locutus/esm/c/string/strchr.js

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

export function strchr(str, c) {
    //  discuss at: https://locutus.io/c/string/strchr/
    // original by: Kevin van Zonneveld (https://kvz.io)
    //      note 1: Returns a pointer to the first occurrence of c in str.
    //      note 1: In JS, returns the substring starting from the first occurrence, or null.
    //   example 1: strchr('Hello, World!', 'o')
    //   returns 1: 'o, World!'
    //   example 2: strchr('Hello', 'x')
    //   returns 2: null
    str = str + '';
    c = (c + '').charAt(0);
    const idx = str.indexOf(c);
    return idx === -1 ? null : str.slice(idx);
}