build/app.js
/**
   * Clears out all children nodes from a given display element
   * @param {String} display
   */
Clears out all children nodes from a given display element
@param {String} display
Clears out all children nodes from a given display element @param { String } display
clearDisplay(display) {
    while (display.firstChild) {
      display.removeChild(display.firstChild);
    }
  }
clearDisplay ( display ) { while ( display . firstChild ) { display . removeChild ( display . firstChild ) ; } }
Clears out all children nodes from a given display element
 @param {String} display
Clears out all children nodes from a given display element @param { String } display