Sanitize JS

gistfile1.js

function coerceToString(val) {
  return String((val === null || val === undefined) ? '' : val);
}

var rAmp = /&/g,
    rLt = /</g,
    rGt = />/g,
    rApos = /\'/g,
    rQuot = /\"/g,
    hChars = /[&<>\"\']/;

function sanitize(str) {
  str = coerceToString(str);
  return hChars.test(str) ?
    str
    .replace(rAmp, '&amp;')
    .replace(rLt, '&lt;')
    .replace(rGt, '&gt;')
    .replace(rApos, '&#39;')
    .replace(rQuot, '&quot;') :
    str;
}