How to inspect JavaScript code

In today's web applications, JavaScript plays an extremely important role, and JavaScript code inspection is a key process to ensure application quality, reliability, and maintainability. In this article, we’ll explore methods and techniques on how to inspect JavaScript code.

1. Use Linters for syntax and code specification checking

Linters is a widely used tool that can check code for syntax errors and code specification issues. The most popular linters in web development right now are ESLint.

ESLint has a powerful configuration and plug-in system that allows you to customize language-specific rules and even create your own rules. It can also be integrated with a wide range of development environments, such as common code editors such as VSCode, Atom, Sublime Text and WebStorm.

2. Static code analyzer

Static code analyzer is a source code-based static analysis technology that can check code quality and reliability without running the code. performance and maintainability. Commonly used static code analyzers in JavaScript are JSLint and JSHint.

JSLint is a JavaScript static code analyzer developed by Douglas Crockford. It is extremely strict in the language and enforces some best practices, such as not allowing variables to leak, using continuous variables, and not using empty statements.

JSHint is a branch of JSLint and a more flexible code analysis tool that can write JavaScript code according to custom rules.

3. Unit Testing

Unit testing in JavaScript code is an automated testing method that ensures that no potential errors or exceptions occur during the execution of the code. Unit testing can be performed during the code development process, which can avoid errors and vulnerabilities that appear before the product is released, and can also make the code more maintainable and easy to extend.

JavaScript unit testing frameworks are very rich, and commonly used ones include Mocha, Jasmine, and Jest.

4. Performance Test

JavaScript application performance is a key factor in Web applications. In Web applications, the performance of JavaScript code has the greatest impact on the performance and speed of the application. It's important. Performance testing checks how quickly and efficiently JavaScript code executes.

Performance testing tools can simulate real-world workloads and data loads, and detect response times and other performance-related content. Commonly used performance testing tools for JavaScript include: Apache JMeter, K6, LoadRunner, etc.

5. Code Review

Code review is one of the important processes for evaluating code quality and maintainability. During the code review process, team members conduct a thorough inspection of the code to identify potential errors and code quality issues to ensure that the code complies with development standards and best practices.

Code reviews apply to any set of code, but especially apply to JavaScript code. Commonly used JavaScript code review tools are CodeClimate, Codacy, Scrutinizer, etc.

6. Use visual tools

In addition to the methods and techniques mentioned above, visual tools can also help check the quality of JavaScript code. These tools can visualize code structure and perform various analyzes to help detect whether the code conforms to best practices and potential problems in the code.

Editors like WebStorm and VSCode can perform visual analysis based on JavaScript code to visualize code quality issues.

Summary

In this article, we introduced methods and techniques on how to inspect JavaScript code. JavaScript code inspections are an ongoing process that ensures code correctness, maintainability, and reliability, thereby ensuring application quality and performance. No matter which technology you choose, it should be considered an essential process for JavaScript code development.

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