murmurhash3_32

function murmurhash3_32(key, seed = 0) {
    const c1 = 0xcc9e2d51;
    const c2 = 0x1b873593;
    const r1 = 15;
    const r2 = 13;
    const m = 5;
    const n = 0xe6546b64;

    let hash = seed;
    let len = key.length;

    const getUint32 = (str, pos) => {
        return (str.charCodeAt(pos) & 0xff) |
               ((str.charCodeAt(pos + 1) & 0xff) << 8) |
               ((str.charCodeAt(pos + 2) & 0xff) << 16) |
               ((str.charCodeAt(pos + 3) & 0xff) << 24);
    };

    let i = 0;
    while (i + 4 <= len) {
        let k = getUint32(key, i);
        k = Math.imul(k, c1);
        k = (k << r1) | (k >>> (32 - r1));
        k = Math.imul(k, c2);

        hash ^= k;
        hash = (hash << r2) | (hash >>> (32 - r2));
        hash = Math.imul(hash, m) + n;
        i += 4;
    }

    let remaining = len % 4;
    if (remaining > 0) {
        let k = 0;
        for (let j = 0; j < remaining; j++) {
            k |= (key.charCodeAt(i + j) & 0xff) << (j * 8);
        }
        k = Math.imul(k, c1);
        k = (k << r1) | (k >>> (32 - r1));
        k = Math.imul(k, c2);
        hash ^= k;
    }

    hash ^= len;
    hash ^= (hash >>> 16);
    hash = Math.imul(hash, 0x85ebca6b);
    hash ^= (hash >>> 13);
    hash = Math.imul(hash, 0xc2b2ae35);
    hash ^= (hash >>> 16);

    return hash >>> 0; // Ensure unsigned 32-bit
}

// Usage
const text = "Hello World";
console.log(murmurhash3_32(text)); // Outputs a number like 2951470589