/**
 * Implements a simple hash code for a string (see
 * https://en.wikipedia.org/wiki/Java_hashCode()).
 *
 * @param {string} The string to return a hash of.
 * @return {Number} the integer hash code of the string.
 */
function integerHash(string) {
    if (!string) {
        return 0;
    }

    let char, hash = 0, i;

    for (i = 0; i < string.length; i++) {
        char = string.charCodeAt(i);
        hash += char * Math.pow(31, string.length - 1 - i);
        hash = Math.abs(hash | 0); // eslint-disable-line no-bitwise
    }

    return hash;
}

module.exports = { integerHash };