p5.js NumberDict maxValue() Method

function setup() {
  createCanvas(550, 300);
  textSize(16);

  text("Click on the button to create a new " +
       "dictionary and get the highest value",
       20, 20);

  setBtn = 
    createButton("Create random dictionary");
  setBtn.position(30, 40);
  setBtn.mouseClicked(createNewDict);

  getBtn = 
    createButton("Get highest Value");
  getBtn.position(300, 40);
  getBtn.mouseClicked(getHighestValue);
}

function createNewDict() {
  clear();

  // Create an object with random values
  let obj = {};
  for (let i = 0; i < 5; i++) {
    let rk = ceil(Math.random() * 100);
    let rn = floor(Math.random() * 100);
    rn = (rk > 25) ? rn : -rn;

    obj[rk] = rn;

    text("Key: " + rk + " : Value: " +
         rn, 40, 120 + 20 * i);
  }

  // Create a dictionary using the above values
  numDict = createNumberDict(obj);

  text("New Dictionary created with values",
       20, 80);

  text("Click on the button to create a new " +
       "dictionary and get the highest value",
       20, 20);
}

function getHighestValue() {

  // Get the highest value in the dictionary
  let highestVal = numDict.maxValue();

  // Display the highest value
  text("The highest value in the dictionary is: " +
       highestVal, 20, 240);

  text("Click on the button to create a new " +
       "dictionary and get the highest value",
       20, 20);
}