PHP's htmlspecialchars implemented in JavaScript

htmlspecialchars.js

// Create the function.
var htmlspecialchars = function(string) {
  
  // Our finalized string will start out as a copy of the initial string.
  var escapedString = string;

  // For each of the special characters,
  var len = htmlspecialchars.specialchars.length;
  for (var x = 0; x < len; x++) {

    // Replace all instances of the special character with its entity.
    escapedString = escapedString.replace(
      new RegExp(htmlspecialchars.specialchars[x][0], 'g'),
      htmlspecialchars.specialchars[x][1]
    );
  }

  // Return the escaped string.
  return escapedString;
};

// A collection of special characters and their entities.
htmlspecialchars.specialchars = [
  [ '&', '&amp;' ],
  [ '<', '&lt;' ],
  [ '>', '&gt;' ],
  [ '"', '&quot;' ]
];