Function escape

docs/external/js/react.development.js:995–1005

* 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)

   */

  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
   * pattern.