The maxKey() method of p5.NumberDict in p5.js is used to find the highest key value in a number dictionary. A key-value pair is a set of two values that are mapped to each other. These values can be accessed by querying this dictionary using the key portion of the pair. A number dictionary can store multiple key-value pairs that can be accessed using the methods of the dictionary.
Syntax:
maxKey()
Parameters: This function does not accept any parameters.
Return Value: It returns a Number value that is the highest key in the number dictionary.
The example below illustrates the maxKey() method in p5.js:
Example 1:
Javascript
function setup() { createCanvas(500, 300); textSize(16); text("Click on the button to add new " + "values or get the highest key", 20, 20); text("Key:", 20, 60); text("Value:", 160, 60); key_input = createInput('1'); key_input.position(70, 50); key_input.size(40); val_input = createInput('1'); val_input.position(220, 50); val_input.size(40); setBtn = createButton("Add new item"); setBtn.position(30, 100); setBtn.mouseClicked(addtoDict); getBtn = createButton("Get Highest Key"); getBtn.position(160, 100); getBtn.mouseClicked(getHighestKey); // Create a Number Dictionary initially numDict = createNumberDict(100, 0); } function addtoDict() { clear(); let key = int(key_input.value()); let val = int(val_input.value()); numDict.set(key, val); text("New key-value added to dictionary", 20, 160); text("Key:", 20, 60); text("Value:", 160, 60); text("Click on the button to add new " + "values or get the highest key", 20, 20); } function getHighestKey() { // Get the highest key in the dictionary let highestKey = numDict.maxKey(); // Display the highest key text("The highest key in the dictionary is: " + highestKey, 20, 200); text("Key:", 20, 60); text("Value:", 160, 60); text("Click on the button to add new " + "values or get the highest key", 20, 20); } |
Output:
Example 2:
Javascript
function setup() { createCanvas(550, 300); textSize(16); text("Click on the button to create a " + "new dictionary and get the highest key", 20, 20); setBtn = createButton("Create random dictionary"); setBtn.position(30, 40); setBtn.mouseClicked(createNewDict); getBtn = createButton("Get Highest Key"); getBtn.position(300, 40); getBtn.mouseClicked(getHighestKey); } 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); obj[rk] = rn; text("Key: " + rk + " : Value: " + rn, 40, 120 + 20 * i); } // Create a number dict 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 key", 20, 20); } function getHighestKey() { // Get the highest key in the dictionary let highestKey = numDict.maxKey(); // Display the lowest key text("The highest key in the dictionary is: " + highestKey, 20, 240); text("Click on the button to create a " + "new dictionary and get the highest key", 20, 20); } |
Output:
Online editor: https://editor.p5js.org/
Environment Setup: https://www.geeksforgeeks.org/p5-js-soundfile-object-installation-and-methods/
Reference: https://p5js.org/reference/#/p5.NumberDict/maxKey
