How Can I Efficiently Hash Strings in JavaScript?

Hashing Strings in Javascript

In the realm of JavaScript, the need arises to transform strings into a compact form of representation known as a hash. Unlike server-side languages, JavaScript presents a unique challenge for this task.

Fortunately, JavaScript provides a solution through the use of the hashCode() method. This method, when applied to a string, generates a unique hash value that serves as a fingerprint for the string.

Example

Implementation:

String.prototype.hashCode = function() {
  var hash = 0,
    i, chr;
  if (this.length === 0) return hash;
  for (i = 0; i < this.length; i++) {
    chr = this.charCodeAt(i);
    hash = ((hash << 5) - hash) + chr;
    hash |= 0; // Convert to 32bit integer
  }
  return hash;
};

Usage:

const str = 'revenue';
console.log(str, str.hashCode());

Output:

revenue 557163167

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