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This article mainly introduces "what are the steps to make JavaScript better". In daily operation, I believe many people have doubts about the steps to make JavaScript better. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the questions about "what steps to make JavaScript better". Next, please follow the editor to study!

01. Code

First of all, call ECMAScript5's strict mode and a "strict mode" declaration in your function, and use the module's design pattern to minimize the use of global variables through sandboxed independent code modules in self-executing function closures, and to keep the global variable module clear and concise through any external dependencies. Only use established, effective, tested and well-tested third-party libraries and frameworks, and keep your functions at a small value. separate any business logic or data from your module operations and other view layer code.

Larger projects with multiple developers should follow a set of established coding principles, such as Google's JavaScript style guide, and require stronger code management rules, including through a library, such as RequireJS, using package management for strict dependency management using asynchronous module definition (AMD), and using wrapper management of Bower or Jam (client library management tool) to refer to specific versions of your dependency files And use structural design patterns, such as the observer pattern, to facilitate loosely coupled communication between different code modules. It's also a sensible idea to use a code repository system, such as Git or Subversion, to have your code backed up in the cloud through services such as source code or magic beans, providing the ability to restore to previous versions, and to create a branch of code for more advanced projects to perform different functions, merging them together before they are done.

02. File

Use structured comment block formats such as YUIDoc or JsDoc to file capabilities, so any developer can understand its purpose without having to study its code, which reduces misunderstandings. With Markdown grammar, you can have richer, lengthy comments and explanations. Use the associated command line tool to automatically generate a document's Web site: based on these structural opinions, it is consistent with the latest status of any changes made in your code.

03. Trail analysis

Run a static code analysis tool, such as JSHint or JSLint, on your code periodically. These checks for known coding defects and potential errors, such as forgetting to use strict patterns or referencing undeclared variables, and missing parentheses or semicolons. Correct any problems with the tool controls to improve the quality of your code. Try setting default options for your project team to strengthen coding standards, such as indenting each line by spaces, where to place curly braces, and using the number of single or double quotes throughout the code file.

04. test

A unit test is one of the functions performed by a small piece of independent functions: execute one of the functions from the main code base of your specific input to confirm that it outputs an expected value. To boost your confidence, the code will, as expected, write frameworks such as Jasmine or QUnit for each functional unit test, using expected and unexpected input parameters. But don't forget the marginal situation!

Run these tests on multiple browsers across multiple operating systems, and by taking advantage of this service, such as BrowserStack or Sauce Labs, you can speed up testing on virtual machines on the cloud in your requirements. These two services provide an API that allows your unit tests to be automatically run in multiple browsers at the same time, and the results will be fed back to you once they are complete. As a bonus, if your code is stored on GitHub, you can take BrowserSwarm, a tool that automatically runs your unit tests when you submit your code.

05. Measure

Code coverage tools such as Istanbul measure which lines of code are executed when your unit test runs against your function and reports it as a percentage of the total number of lines of code. Running a code coverage tool on your unit tests and adding additional tests can increase your coverage score to 100%, giving you more confidence in your code.

The complexity of a function can be measured by the Halsted complexity metric: the equation established by computer scientist Maurice Halsted in the 1970s, the complexity of a function is quantified by loops, branches, and the function calls it contains: the complexity of a function can be measured using Halstead's complexity measures. When this complex score decreases, the easier it is for us to understand and maintain the function, reducing the possibility of error. The command-line tool Platonic measures and visualization of the data generated by JavaScript code complexity help identify features that can be improved while storing previous results, allowing quality improvements to be tracked over time.

06. Automation

Use Task runner such as Grunt to automate the process of documentation, analysis, testing, coverage, and complexity report generation, which saves you time and effort and increases your chances of solving any quality problems that arise. Most of the tools and testing frameworks highlighted in this article are associated with Grunt, which can help you improve your workflow and code quality without touching a finger.

07. Handling exceptions

Coincidentally, at some point, your code will have an error when it runs. Use the "try... Catch" statement to properly handle run-time errors and limit the impact of behavior on your site. Use network services to record errors that occur at run time. And use this information to add new unit tests to improve your code and eliminate these errors one by one.

At this point, the study on "what are the steps to make JavaScript better" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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