p5.Element class() Method

function setup() {
  createCanvas(550, 300);
  textSize(18);

  text("Click on the button to add the given " +
       "class(es) to the element", 20, 20);

  setBtn = 
    createButton("Create new Element with given classes");
  setBtn.position(30, 40);
  setBtn.mouseClicked(createNewElement);

  setBtn = 
    createButton("Show Last Element class");
  setBtn.position(300, 40);
  setBtn.mouseClicked(showClasses);

  class_name = createInput('tmpClass');
  class_name.position(30, 80);
}

function createNewElement() {
  clear();

  // Create a new p5.Element
  tmpElement = createElement("div");

  // Get the class to set
  let classToSet = class_name.value();

  // Set the class of the element
  tmpElement.class(classToSet);

  text("Class set with the names: " +
       classToSet, 30, 120);

  text("Click on the button to add the given " +
       "class(es) to the element", 20, 20);
}

function showClasses() {
  clear();

  // Get the classes of the element
  let setClasses = tmpElement.class();

  // Display the classes
  text("The classes of the element are: " +
       setClasses, 30, 120);

  text("Click on the button to add the given " +
       "class(es) to the element", 20, 20);
}