code: function camelize(str) {
      return str
          .replace(STRING_CAMELIZE_REGEXP, (_match, _separator, chr) => {
          return chr ? chr.toUpperCase() : '';
      })
          .replace(/^([A-Z])/, (match) => match.toLowerCase());
  }
docs: Returns the lowerCamelCase form of a string.
  
  ```javascript
  camelize('innerHTML');          // 'innerHTML'
  camelize('action_name');        // 'actionName'
  camelize('css-class-name');     // 'cssClassName'
  camelize('my favorite items');  // 'myFavoriteItems'
  camelize('My Favorite Items');  // 'myFavoriteItems'
  ```