async is es7. async and await are new additions to ES7 and are solutions for asynchronous operations; async/await can be said to be syntactic sugar for co modules and generator functions, solving js asynchronous code with clearer semantics. As the name suggests, async means "asynchronous". Async is used to declare that a function is asynchronous; there is a strict rule between async and await. Both cannot be separated from each other, and await can only be written in async functions.

Building a vue3 project Before creating a project, the first thing we need to explain is that the version we use is Nodejs: v17.5.0pnpm: 7.0.0Vue: 3.2.25. First, we Vite creates a vue3 project demo named FormValidate. Enter the command pnpmcreateviteFormValidate on the command line and press Enter, then select vue and continue to press Enter, indicating that we have initially created the FormValidate (form validation) project. According to the command line prompts, we enter the project root directory, and then use the command pnpminstall to install the dependencies required for the project. Of course Using pnpm here is better than n

How to use async/await to handle asynchronous operations in Vue With the continuous development of front-end development, we need to handle more complex asynchronous operations in Vue. Although Vue already provides many convenient ways to handle asynchronous operations, in some cases, we may need to use a simpler and more intuitive way to handle these asynchronous operations. At this time, async/await becomes a very good choice. What is async/await? In ES2017, async and

What is the defer keyword in Go language? When writing programs, we often need to perform some cleanup or resource release work after a certain function or method is executed. At this time, the Go language provides a convenient mechanism. By using the defer keyword, these cleanup or resource release tasks can be postponed until the function or method returns. The defer keyword is a syntax sugar that is parsed at compile time. It defers the call of a function or method until the current function or method returns.

Coroutine: Coroutine, also known as micro-thread, is a context switching technology in user mode. In short, it is actually a thread to implement code blocks to switch between executions. Python's support for coroutines is implemented through generators. In the generator, we can not only iterate through the for loop, but also continuously call the next() function to obtain the next value returned by the yield statement. But Python's yield can not only return a value, it can also receive parameters sent by the caller. 1. What is a generator? In Python, this mechanism of looping and calculating at the same time is called a generator: gene

1. The traditional Sync syntax request example is still the same. Before understanding the implementation of Async syntax, let's start with a Sync syntax example. Now suppose there is an HTTP request. This program will obtain the corresponding response content through this request and print it out. , the code is as follows: import socket def request(host: str) -> None: """Simulate the request and print the response body""" url: str = f"http://{host}" sock

Golang is an efficient, concise and easy-to-learn programming language that was originally developed by Google and first released in 2009. It is designed to improve programmer productivity and code clarity. In Golang, the function keywords defer and recover are often used together to handle errors that may occur in the program. This article will introduce the use of these two keywords and illustrate their practical application through some examples. 1. How to use defer defer is a keyword

The defer and panic keywords are used to control exceptions and post-processing: defer: push the function onto the stack and execute it after the function returns. It is often used to release resources. Panic: Throws an exception to interrupt program execution and is used to handle serious errors that cannot continue running. The difference: defer is only executed when the function returns normally, while panic is executed under any circumstances, even if an error occurs.