bbo/hash.js

bbo is a utility library of zero dependencies for javascript.

'use strict';

require('./get_tag.js');
require('./is_array.js');
require('./is_string.js');
require('./is_map.js');
require('./is_set.js');
var size = require('./size.js');

/**
 * string hash map
 * From https://stackoverflow.com/questions/7616461/generate-a-hash-from-string-in-javascript-jquery
 */
function hash(str) {
  var _str = String(str);

  var hash = 0;
  var i;
  var chr;
  if (size(_str) === 0) return hash;

  for (i = 0; i < _str.length; i++) {
    chr = _str.charCodeAt(i);
    hash = (hash << 5) - hash + chr;
    hash |= 0; // Convert to 32bit integer
  }

  return hash;
}

module.exports = hash;