Function escape

code/controlled-uncontrolled/public/app.js:18306–18317

* Escape and wrap key so it is safe to use as a reactid * * @param {string} key to be escaped. * @return {string} the escaped key.

(key)

 * @return {string} the escaped key.
 */
function escape(key) {
  var escapeRegex = /[=:]/g;
  var escaperLookup = {
    '=': '=0',
    ':': '=2'
  };
  var escapedString = ('' + key).replace(escapeRegex, function (match) {
    return escaperLookup[match];
  });

  return '$' + escapedString;
}

/**
 * TODO: Test that a single child and an array with one item have the same key