30-seconds-of-code/javascript/snippets/sdbm.md

title, type, tags, cover, dateModified

title	type	tags	cover	dateModified
Hash string into number	snippet	math	dark-leaves	2020-10-22T20:24:30+03:00

Hashes the input string into a whole number.

• Use String.prototype.split() and Array.prototype.reduce() to create a hash of the input string, utilizing bit shifting.

const sdbm = str => {
  let arr = str.split('');
  return arr.reduce(
    (hashCode, currentVal) =>
      (hashCode =
        currentVal.charCodeAt(0) +
        (hashCode << 6) +
        (hashCode << 16) -
        hashCode),
    0
  );
};

sdbm('name'); // -3521204949