function escape(string) {
      return string == null ? '' : String(string).replace(reUnescapedHtml, escapeHtmlChar);
    }
Converts the characters `&`, `<`, `>`, `"`, and `'` in `string` to their
corresponding HTML entities.

@static
@memberOf _
@category Utilities
@param {string} string The string to escape.
@returns {string} Returns the escaped string.
@example

_.escape('Fred, Wilma, & Pebbles');
// => 'Fred, Wilma, &amp; Pebbles'