Java-compatible string hash

string-hash.js

function hashString (s) {
    if (s.length === 0) {
        return 0
    }
    let hash = 0
    for (let i = 0; i < s.length; i++) {
        const char = s.charCodeAt(i)
        hash = (( hash << 5 ) - hash) + char
        // Convert to 32-bit integer
        hash = hash & hash
    }
    return hash
}