Detailed explanation of p5.js keyboard interaction

Pure functions ensure that the same input always gets the same output without side effects, making it easier to test and concurrent processing; 2. Use immutable data to avoid hidden bugs by creating new versions instead of modifying the original data, especially in React/Redux; 3. High-order functions allow functions to be passed and combined, such as map/filter/reduce to rely on this feature to achieve flexible logic; 4. Function combinations connect small functions like pipelines to improve modularity and readability; 5. Use map/filter/reduce to replace loops to implement declarative, secure and easy to chain call code, ultimately making JavaScript code more reliable and easy to maintain.

The methods to get the current date and time in JavaScript are as follows: 1. Use newDate() to create a date object to get the full date and time; 2. Use getFullYear(), getMonth(), getDate() and other methods to obtain year, month, day and time units respectively; 3. Use string splicing or padStart() to achieve custom formatted output; 4. Use toLocaleString() to output in local format, and you can also specify language and region. The core of these methods is to operate the Date object and pay attention to problems such as starting from 0 in the month, so as to flexibly respond to different needs.

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The ?? operator should be used when dealing with a default value scenario with null or undefined, as it returns the right default value only if it is null or undefined on the left. 1. Unlike ||, ?? will not treat empty strings, 0, false values such as false values as invalid; 2. It is often used to set the default value of function parameters, such as functiongreet(user){console.log(${user??'sranger'});}; 3. It is suitable for safely taking values from objects, such as constusername=data.user??'Anonymous'; 4. It can be used with optional chains, such as user.profile?.

SharedArrayBuffer and Atomics are key tools in JavaScript for multithreaded shared memory and synchronous operations. 1. SharedArrayBuffer allows multiple threads to access the same piece of memory, which is suitable for data sharing between the main thread and WebWorker; 2. Atomics provides atomic operations such as load, store, add, wait and notify to ensure thread safety; 3. Using SharedArrayBuffer requires the server to enable COOP and COEP headers, and some environments such as old browsers or privacy modes do not support it; 4. In actual development, it is recommended to use Promise or async/aw first.

There are three ways to check whether an array contains a certain value in JavaScript: one is to use the includes() method, which returns a boolean value to indicate whether the specified element exists, such as arr.includes(valueToFind, fromIndex); the second is to use the indexOf() method to determine whether the return value is -1 to achieve stronger compatibility detection; the third is to use some() or find() for object arrays to compare by fields, because include() cannot correctly compare the reference types.

JavaScript object creation method is based on prototype rather than class. Constructor Prototype combination mode defines instance properties through constructors and defines shared methods for prototypes, such as functionPerson(name){this.name=name;}Person.prototype.sayHello=function(){console.log("Hello,I'm" this.name);};constp1=newPerson("Alice");p1.sayHello(); Factory function mode encapsulates the logic of the return object, such as fu

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