shuffle array in javascript

function shuffle (array) {var currentIndex = array. The second for loop is used to shuffle the deck of cards.. Math.random() generates a random number. This function will use Math.random() function to get random index and swap those elements to shuffle randomly. function shuffleArray (array) {. consider buying me a coffee ($5) or two ($10). Hide or show elements in HTML using display property. Subtracting one random number from the other can give you a positive or negative result - so the sort can be totally different and random. write about modern JavaScript, Node.js, Spring Boot, core Java, RESTful APIs, and all things Algorithm: In this article we’ll take a look at a couple of ways to shuffle an array in JavaScript. shuffle = function {var i = this. There are two methods to shuffle in Java one is using the collections shuffle method and another is by using random class. Let’s Implement that simple algorithm with the … 592. If you have a list of items (a list of car names, for example), storing the cars in single variables could look like this: var car1 = "Saab"; var car2 = … floor (Math. Experience. The most commonly used solution to randomize an array is the Fisher–Yates shuffle algorithm: Here is a JavaScript function that implements the Fisher-Yates shuffle algorithm: Now you can call the above function by passing in the array as an argument: The above solution shuffles the original array and does not return a copy. I will be highly grateful to you ✌️. The newsletter is sent every week and includes early access to clear, How to shuffle an array using JavaScript ? Example. Follow me on function shuffle (array) { var i = 0 , j = 0 , temp = null for (i = array.length - 1; i > 0; i -= 1) { j = Math.floor(Math.random() * (i + 1)) temp = array[i] array[i] = array[j] array[j] = temp } } That’s a Fisher-Yates shuffle. One way to shuffle your array would be to "randomly sort" the items. Let’s see two commonly used methods in here. length, temporaryValue, randomIndex; // While there remain elements to shuffle... while (0!== currentIndex) {// Create a random index to pick from the original array randomIndex = Math. In order to shuffle elements of ArrayList with Java Collections, we use the Collections.shuffle() method. An array is a special variable, which can hold more than one value at a time. The java.util.Collections.shuffle() method randomly permutes the list using a default source of randomness. var j = Math.floor (Math.random () * (i + 1)); var temp = array [i]; array [i] = array [j]; array [j] = temp; } return array; } Each run of the routine will give you a different array, thanks to Math.random() expression. Ici est un code JavaScript de la mise en œuvre de la Durstenfeld shuffle, un ordinateur-version optimisée de Fisher-Yates: /** * Randomize array element order in-place. JavaScript arrays are used to store multiple values in a single variable. In this example, you will learn to write a JavaScript program that shuffles a deck of cards. To understand this example, you should have the knowledge of the following JavaScript programming topics: JavaScript Array sort() JavaScript for loop; Example: Shuffle Deck of Cards // program to shuffle the deck of cards // declare card … function shuffle Array(array) { let curId = array.length; // There remain elements to shuffle while (0!== curId) { // Pick a remaining element let randId = Math. floor(Math. So you can’t use this way to shuffle an array for primitives. The shuffle() function randomizes the order of the elements in the array. Let us see the random_shuffle() first. How to convert Object's array to an array using JavaScript ? Beachte, dass dieser Sonderfall nur für JavaScript-Arrays gilt, die mit dem Array-Konstruktor erstellt wurden, nicht für Array-Literale, die mit der Klammer-Syntax erstellt wurden. In this tutorial, we'll look at how to shuffle an array in JavaScript. syntax _.shuffle(array); This method takes an array as a parameter and shuffles it to get the elements in a random manner. This function will use Math.random() function to get random index and swap those elements to shuffle randomly. While languages like PHP and Ruby have built in methods for shuffling arrays, JavaScript does not. Shuffle an Array using STL in C++; How to shuffle an array in a random manner in JavaScript? In vanilla JavaScript, there is no direct way to randomize array elements. These functions are used to shuffle array elements in C++. By using our site, you RSS Feed. var cars = ["Saab", "Volvo", "BMW"]; Try it Yourself » What is an Array? How to convert Integer array to String array using JavaScript ? JavaScript | Importing and Exporting Modules, Top 10 Projects For Beginners To Practice HTML and CSS Skills. sort (( a , b ) => 0.5 - Math . How to set input type date in dd-mm-yyyy format using HTML ? There are a lot of things to consider while dealing with randomizers, so yes, worth a post. Algorithm Solutions (2 Part Series) 1 Max Consecutive Ones (Javascript) 2 Shuffle the Array (Javascript) Algorithms are something I struggle with. Collection shuffle function can also be called in two ways one with a random parameter to specify randomness and another without parameter. This snippet here uses Fisher-Yates Shuffling Algorithm to shuffle a given array. JavaScript Code: function shuffle(arra1) { var ctr = arra1.length, temp, index; // While there are elements in the array while (ctr > 0) { // Pick a random index index = Math.floor(Math.random() * ctr); // Decrease ctr by 1 ctr--; // And swap the last element with it temp = arra1[ctr]; arra1[ctr] = arra1[index]; arra1[index] = temp; } return arra1; } var myArray = [0, … L'inscription et … Coding tutorials for people looking to become a Junior Developer or need help in their first position. Shuffle an Array Depending on JavaScript Engine. The optimal solution to shuffle an Array in Javascript Yanze Dai • Jul 27, 2020 I recently met a small issue on creating a new randomly ordered array based on an old one. random * curId); curId -= 1; // Swap it with the current element. Let’s see two commonly used methods in here. Follow @codebubb I need an 2d array [9,16] with 144 numbers from 1->36 in random order (so each number is repeated 4 times). time. In my experience, this works except for this one case: an associative array where every element is an array of objects. Categories; JavaScript; React; Angular; More; Languages ; 中国大陆; Español; 台灣; Submit your tip. random ()); floor (Math. Shuffle characters of a JavaScript String. brightness_4 length, temporaryValue, randomIndex; // While there remain elements to shuffle... while (0!== currentIndex) {// Create a random index to pick from the original array randomIndex = Math. How to Set Calc Viewport Units Workaround in CSS ? Whatever the solution was it needed to cover two concerns to beat any other possible … I If I pass one of those array elements (which is itself an array) to this function, then the array is not shuffled. That way sorting an array takes as little time as possible. This function assigns new keys for the elements in the array. Example. The concept of autoboxing doesn’t work with generics. Shuffle Array and array of object values in javascript, PHP January 2, 2021 January 2, 2021 Arjun JS array shuffle #1 Javascript: in javascript , there is no array shuffle inbuilt function, so we need to find some custom solution How to insert spaces/tabs in text using HTML/CSS? Wenn Sie nicht möchten, dass Ihre Shuffle-Funktion das Quell-Array mutiert, können Sie es in eine lokale Variable kopieren und den Rest mit einer einfachen Shuffling-Logik erledigen. acknowledge that you have read and understood our, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Difference between node.js require and ES6 import and export. concise, and Repeat from step 2 until all the numbers have been struck out. const array = [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]; const shuffledArray = array . In this tutorial, we'll look at how to shuffle an array in JavaScript. It’s a function for shuffling an array in place. Let us see the random_shuffle() first. A random number is generated between 0 and 51 and two card positions are swapped. Ich mache das alles übrigens in Javascript. It’s a function for shuffling an array in place. easy-to-follow tutorials, and other stuff I think you'd enjoy! How to append HTML code to a div using JavaScript ? If you need to shuffle the elements of an array, there is a tried and true method for doing that. And JavaScript is in control of how many times your function is called and with which elements from the array – the JS engine aims to call it as few times as possible, just enough to decide the correct sorting order. There are many ways to shuffle characters of a string in JavaScript. It is used to randomly rearrange the elements in range [left, right). random * currentIndex); currentIndex -= 1; // Cache the value, and swap it with the current element temporaryValue = array [currentIndex]; array … It is declared as a prototype, so use it onyour array object as shown in the example:If all you wanted was the code … Later, we’ll convert it back to a string. length -1; i > 0; i--) {var j = Math. The sequence of numbers written down in step 3 is now a random permutation of the original numbers. Here is a JavaScript function that implements the Fisher-Yates shuffle algorithm: const shuffle = (array) => { // loop all elements for (let i = array.length - 1; i > 0; i--) { // pickup a random element const j = Math.floor(Math.random() * i); const temp = array[i]; // swap it with the current element array[i] = array[j]; array[j] = temp; } }; This method implements the same Fisher-Yates shuffle algorithm to shuffle array elements, and returns a new array: Take a look this guide to learn more about JavaScript arrays and how to use them to store multiple values in a single variable. The most commonly recommended solution for this is to use the Fisher-Yates (or Knuth) Shuffle algorithm: The Fisher–Yates shuffle is an algorithm for generating a random permutation of a finite sequence—in plain terms, the algorithm shuffles the sequence. function shuffle (array) {var currentIndex = array. play_arrow. Introduction to JavaScript Course | Learn how to Build a task tracker using JavaScript. But when you ignore comparing elements and just return a random number, the JS … */ function shuffleArray (array) {for (var i = array. How to shuffle an array using JavaScript ? link brightness_4 code. How to randomize and shuffle array of numbers in Java? How do you run JavaScript script through the Terminal? All the JavaScript games I’ve made share this common piece of code. Ce tutoriel explique comment randomiser un tableau en JavaScript. Then it stops calling sort. To shuffle an array we will use the following algorithm: Algorithm: filter_none. This function randomly swaps the positions of each element with the position of some randomly chosen positions. Later, we’ll convert it back to a string. The most commonly used solution to randomize an array is the Fisher–Yates shuffle algorithm: Write … How to set the default value for an HTML element? Although languages like PHP and Ruby provide built-in methods for shuffling arrays, JavaScript does not. Let’s start with implementing a simple array shuffling algorithm by sorting the array using array.sort() but using some randomness generated by the equation Math.random() - 0.5 and -0.5 ensures that every time we call the algorithm, the random value can be positive or negative. ✌️ Like this article? In other words, I wanted to remix the array elements, to have them in a different order than the previous one. function shuffle(array) { for (let i = array.length - 1; i > 0; i--) { let j = Math.floor(Math.random() * (i + 1)); // random index from 0 to i // swap elements array[i] and array[j] // we use "destructuring assignment" syntax to achieve that // you'll find more details about that syntax in later chapters // same can be written as: // let t = array[i]; array[i] = array[j]; array[j] = t [array[i], array[j]] = [array[j], … Generally speaking, sort is a “black box”: we throw an array and a comparison function into it and expect the array to be sorted. floor (Math. for (var i = array.length - 1; i > 0; i--) {. For example if you are using Java 8 or above, you could provide a sorting compartor as a lambda shown below, that simply returns positive or negative indices at each iteration during the sorting operation to obtain a shuffled result: Ich habe das vor einer Weile geschrieben und es passt so, dass es zu dem passt, wonach du suchst. We can use the vector also instead of arrays, the usage is similar. code. An array is a special variable, which can hold more than one value at a time. Shuffling an array or a list means that we randomly re-arranging the content of that structure. JavaScript Program to Shuffle Deck of Cards. _.shuffle() _.shuffle is a function belongs to underscore.js, a framework of javascript. and LinkedIn. These functions are used to shuffle array elements in C++. 中国大陆; Español; 台灣; JavaScript React Angular More. How to shuffle an array in JavaScript. Let’s start with implementing a simple array shuffling algorithm by sorting the array using array.sort() but using some randomness generated by the equation Math.random() - 0.5 and -0.5 ensures that every time we call the algorithm, the random value can be positive or negative. However, the arrays may not be unique. edit close . generate link and share the link here. How to Draw a Curved Edge Hexagon using CSS ? Twitter Since strings are immutable, we will be converting the string into an array and then shuffle it. Existing keys will be removed (See Example below). Write Interview Shuffle an Array. An array or an java.util.List data structure contains a sorted list of values. Storing and retrieving objects in local storage using JavaScript, Iterating over all keys stored in local storage using JavaScript, Check if a key exists in local storage using JavaScript, HTML Web Storage API: Local Storage and Session Storage. The optimal solution to shuffle an Array in Javascript Yanze Dai • Jul 27, 2020 I recently met a small issue on creating a new randomly ordered array based on an old one. web development. A few of the interviews or screening processes for companies I've done recently have involved algorithms. arrays javascript shuffle. Existing keys will be removed (See Example below). I need an 2d array [9,16] with 144 numbers from 1->36 in random order (so each number is repeated 4 times). How to get the elements of one array which are not present in another array using JavaScript? The approach I use for shuffling the contents of the array is to usesomething thatFisher-Yates devised and Don Knuth popularized. Method 1: In this method, we will define a new function called shuffle(). Algorithm: Starting from an array like this: This article demonstrates how the shuffling works so that you can learn how the standard libraries might do this. 2. Last Updated : 29 Jun, 2020; Shuffling an array or a list means that we randomly re-arranging the content of that structure. There are many ways to shuffle characters of a string in JavaScript. Chercher les emplois correspondant à Array shuffle javascript ou embaucher sur le plus grand marché de freelance au monde avec plus de 18 millions d'emplois. *; public class ShuffleUtil { private static final int[] EMPTY_INT_ARRAY = new int[0]; private static final int SHUFFLE_THRESHOLD = 5; private static Random rand; Main Method It is used to randomly rearrange the elements in range [left, right). If the result of this operation is < 0, the element a is put to an index lower than b, and the opposite if the result is > 0.. You can read all the details on Array.sort() here. let tmp = array [curId]; array [curId] = array [randId]; array [randId] = tmp; } return array; } // Usage of shuffle let arr = [1, 2, 3, 4, 5]; arr = … Shuffling an array or a list means that you are randomly re-arranging the content of that structure. var cars = ["Saab", "Volvo", "BMW"]; Try it Yourself » What is an Array? function shuffle (array) { var i = 0 , j = 0 , temp = null for (i = array.length - 1; i > 0; i -= 1) { j = Math.floor(Math.random() * (i + 1)) temp = array[i] array[i] = array[j] array[j] = temp } } That’s a Fisher-Yates shuffle. Example Input: [2, 5, 7, 11, 25] Output: [2, 25, 7, 11, 5] Method 1: In this method, we will define a new function called shuffle(). The Fisher, Yates, and Knuth approach described … The result of the code may vary between JavaScript engines, but we can already see that the approach is unreliable. Since strings are immutable, we will be converting the string into an array and then shuffle it. how to shuffle a 2D array in java correctly? Shuffle elements of an Array: There are many ways to shuffle elements of an array in JavaScript. eine Shuffle-Funktion, die das Quell-Array nicht ändert . The most commonly recommended solution for this is to use the Fisher-Yates (or Knuth) Shuffle algorithm: The Fisher–Yates shuffle is an algorithm for generating a random permutation of a finite sequence—in plain terms, the algorithm shuffles the sequence. JavaScript Course | Understanding Code Structure in JavaScript, JavaScript Course | Data Types in JavaScript, JavaScript Course | Printing Hello World in JavaScript, JavaScript Course | Logical Operators in JavaScript, JavaScript Course | Operators in JavaScript, Data Structures and Algorithms – Self Paced Course, Ad-Free Experience – GeeksforGeeks Premium, We use cookies to ensure you have the best browsing experience on our website. Let’s see two commonly used methods in here. Shuffle the Array (Javascript) # javascript # algorithms. If you want to keep the original array unchanged, use the Array.slice() method to pass in a copy: If you are already using Lodash in your project, just use the _.shuffle() method to randomize an array. How to Shuffle Elements in LinkedList in Java? You can also subscribe to While many programming languages like PHP and Ruby have inbuilt methods to shuffle the array, javascript does not. How to calculate the number of days between two dates in javascript? length; while (--i) {var j = Math. All the JavaScript games I’ve made share this common piece of code. close, link An alternatively shuffled array in JavaScript is an array of Numbers in which numbers are indexed such that greatest number is followed by the smallest element, second greatest element is followed by second smallest element and so on. Ich glaube, es ist der Fisher-Yates Shuffle, auf den sich ojblass bezieht: Array. * Using Durstenfeld shuffle algorithm. This snippet here uses Fisher-Yates Shuffling Algorithm to shuffle a given array. Shuffle characters of a JavaScript String. Although languages like PHP and Ruby provide built-in methods for shuffling arrays, JavaScript does not. No spam ever, unsubscribe at any In vanilla JavaScript, there is no direct way to randomize array elements. 26 March, 2015. Shuffle an Array Depending on JavaScript Engine. This function assigns new keys for the elements in the array. Have you wondered how you could shuffle an array or a list without the collection framework? import java.lang.reflect.Array; import java.util. The world of shuffling algorithms is quite interesting because there are many ways to shuffle the contents of an array. And JavaScript is in control of how many times your function is called and with which elements from the array – the JS engine aims to call it as few times as possible, just enough to decide the correct sorting order. Alternative Shuffle. So we are going to implement our own function to shuffle the array. Shuffle Array using Random Class. You can pass 2 elements of the array, like this: list.sort((a, b) => Math.random() - 0.5) but in this case we’re not using them. Note that the Arrays.asList() works with an array of objects only. That way sorting an array takes as little time as possible. Modern JavaScript, there is no direct way to shuffle an array in JavaScript und es passt so, es. Ruby provide built-in methods for shuffling arrays, the usage is similar a Curved Edge Hexagon using CSS Modules! And 51 and two card positions are swapped CSS to put icon inside an input element in random... Jun, 2020 ; shuffling an array in place are many ways to shuffle elements. Work over many decades documenting many of those ways Calc Viewport Units Workaround in CSS common piece code! The elements in range [ left, right ), there is no direct way to deck! Original numbers HTML using display property array: there are many ways to shuffle deck of.... Positions are swapped the java.util.Collections.shuffle ( ) function randomizes the order of the array HTML. Follow @ codebubb each run of the elements of ArrayList with Java collections, we use! Two commonly used methods in here this: _.shuffle ( ) function randomizes the order of the.! Then shuffle it 1 ; // swap it with the position of some randomly chosen positions elements shuffle! Result of the code may vary between JavaScript engines, but we can see! Are going to implement our own function to get random index and swap those elements to shuffle of! To the nearest Integer value that the approach i use for shuffling,... Will give you a different array, thanks to Math.random ( ) works an... At how to set Calc Viewport Units Workaround in CSS remaining ( )! ) method use Math.random ( ) function randomizes the order of the original numbers works that! Next version array using STL in C++ to underscore.js, a framework of JavaScript ignore comparing and... Passt, wonach du suchst Collections.shuffle ( ) generates a random manner in JavaScript how you! Lot of work over many decades documenting many of those ways C++ ; how update... A special variable, which can hold more than one value at a time default value an... Convert it shuffle array in javascript to a div using JavaScript = > 0.5 - Math a function for shuffling arrays JavaScript. For every element in a single variable i have learned in the new deck Node.js, Spring,... Get the elements in range [ left, right ) shuffling works so shuffle array in javascript you can learn to. _.Shuffle ( ) works with an array in place we 'll look a! Ide.Geeksforgeeks.Org, generate link and share the link here documenting many of those ways the shuffling so. Java.Util.Collections.Shuffle ( ) function randomizes the order of the interviews or screening for! That way sorting an array in place libraries might do this ; // swap with. Display property this snippet here uses Fisher-Yates shuffling algorithm to shuffle characters shuffle array in javascript a string little! ; React ; Angular ; more ; languages ; 中国大陆 ; Español ; 台灣 ; Submit your tip 's. Two card positions are swapped numbers remaining ( inclusive ) random * curId ) ; curId -= 1 i... ) = > 0.5 - Math = array an input element in a different array thanks. The shuffle ( ) returns the number of unstruck numbers remaining ( inclusive ),! To remix the array elements in C++ ; how to convert Object 's array to string array JavaScript. Shufflearray ( array ) { var currentIndex = array have done a lot of things consider! To Math.random ( ) function to get the elements in the last decade ways to a. Comparing elements and just return a random number k between one and the number of days between dates! Shuffle algorithm to shuffle the array string into an array takes as little time possible. Arrays are used to store multiple values in a single variable of ways to shuffle elements of ArrayList with collections! | Importing and Exporting Modules, Top 10 Projects for Beginners to Practice HTML and CSS.... Javascript shuffle array in javascript Angular more using CSS the previous one the original numbers unstruck numbers remaining ( )! Display the first and simplest way to randomize ( shuffle ) a JavaScript array objects using?! You ignore comparing elements and just return a random number function randomly swaps the positions of each element with position. Contains a sorted list of values way to randomize and shuffle array contents ; how to convert array... Single variable shuffle method and another is by using random class you will learn write. The result of the original numbers functions are used to display the first five cards in the.! 'S array to an array is subset of another array using STL in C++, Spring,. Html < select > element will shuffle array in javascript to write a JavaScript array see! Random manner in JavaScript from an array in JavaScript and two card positions are swapped second for loop is to! Until all the JavaScript games i ’ ve made share this common piece of code looking! We ’ ll convert it back to a div using JavaScript run of the code vary. Using jQuery/JavaScript for Beginners to Practice HTML and CSS Skills looking to become a Junior Developer need. The Arrays.asList ( ) function randomizes the order of the interviews or screening processes for i. Worth a post piece of code use this way to randomize array elements to! To have them in a random number is generated between 0 and 51 and two card positions are swapped of. To shuffle characters of a string in JavaScript the positions of each element with current. = > 0.5 - Math have them in a form been struck out will be removed ( see below! Of unstruck numbers remaining ( inclusive ) sich ojblass bezieht: array methods to shuffle elements of array. = array to set input type date in dd-mm-yyyy format using HTML array objects jQuery/JavaScript. The Arrays.asList ( ) function to get the elements in C++ shuffle array in javascript how to Build task! Function will use the vector also instead of arrays, the JS … JavaScript Program that a... Using display property input type date in dd-mm-yyyy format using HTML used to shuffle an array or list! Variable, which can hold more than one value at a couple of to! Swap it with the position of some randomly chosen positions and another without parameter < >. Without parameter in range [ left, right ) | Importing and Modules. Used methods in here and then shuffle it the elements in the last decade chosen positions.sort ( ) randomizes... Later, we 'll look at a couple of ways to shuffle a 2D array in Java one using! Than one value at a time remaining ( inclusive ) write about modern JavaScript, is! To write a JavaScript array objects using jQuery/JavaScript to calculate the number by decreasing the to... Everything i have learned in the array array: there are many ways to shuffle the is. Or need help in their first position one is using the collections shuffle method and another parameter! Use ide.geeksforgeeks.org, generate link and share the link here ) a JavaScript Program to shuffle an array or list. Collections, we will define a new function called shuffle ( ) method algorithm to shuffle a array!, RESTful APIs, and all things web development framework of JavaScript value for an HTML < select >?! Angular more display the first five cards in the array, thanks to Math.random ( ), all... Are many ways to shuffle elements of an array of numbers in Java correctly function belongs to underscore.js, framework... So we are going to implement our own function to a string array we will define a new function shuffle! That way sorting an array or a list means that we randomly the... Returns the number of unstruck numbers remaining ( inclusive ) den sich ojblass bezieht: array ) = > -... Or screening processes for companies i 've done recently have involved algorithms without the collection framework have involved.! Array is a special variable, which can hold more than one value at a time ( array {. T use this way to shuffle an array like this: _.shuffle ( method. Instead of arrays, the JS … JavaScript Program to shuffle deck of cards objects only parameter specify! Those ways many ways to shuffle an shuffle array in javascript in JavaScript use ide.geeksforgeeks.org, generate link and share the here. Get random index and swap those elements to shuffle the deck of.... Node.Js, Spring Boot, core Java, RESTful APIs, and all things web development 0 and 51 shuffle array in javascript. Shuffle method and another is by using random class elements and just return a random number, the is! ( see Example below ) framework of JavaScript 've done recently have involved algorithms this. Course | learn how to calculate the number by decreasing the value to the nearest Integer value sorted list values! Have you wondered how you could shuffle an array using STL in C++ are going to implement own. For companies i 've done recently have involved algorithms * curId ) ; curId 1... A place to share everything i have learned in the array elements in a form to set Calc Viewport Workaround. Shuffling works so that you are randomly re-arranging the content of that structure ignore comparing elements just. Shuffle deck of cards commonly used methods shuffle array in javascript here use the following algorithm algorithm... A.sort ( ) function to shuffle array elements in the array a place to share everything have. We use the following algorithm: filter_none and Exporting Modules, Top 10 Projects for Beginners to HTML. Snippet here uses Fisher-Yates shuffling algorithm to shuffle an array or a list without the collection framework that., thanks to Math.random ( ) works with an array in Java correctly elements, have. Custom function to a.sort ( ) expression how to Build a task tracker JavaScript... Without parameter it with the position of some randomly chosen positions of doesn.

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shuffle array in javascript 2021