What are the benefits of automated testing of js code?
1. When developers write test scripts, they can better understand the code's functions, return values, etc.
2. Able to achieve accurate and direct testing, and immediately see the test results and make adjustments.
3. In the face of complex projects, code modifications may affect the whole body. Code changes may affect the functions of other parts. Automated testing can help us check it as a whole.
4. The test results can be used as a basis for code quality.
Search for "explore js testing" on segmentfault, and you can get three series of articles explaining js testing. The address of the first article: https://segmentfault.com/a/11...
Need to use Knowledge includes: BDD test mode, Mocha test framework, chai assertion library, prefer to use expect/should, istanbul test coverage tools,
Here is a brief introduction http://www.ruanyifeng.com/blo... , you need to learn how to use makefiles, supertest is a tool for testing API interfaces
Tested projects: https://github.com/yylgit/tes...
The project is connected to the travis platform
Build.travis. yml file, file content
language: node_js node_js: - "5" - "4"
travis executes the test command of the scripts in the package
After accessing, you can see on the travis platform that the test is re-executed every time there is a change in the warehouse, https://travis-ci.org /yylgit/...
travsi is tested in a new environment every time
Connect to the coveralls platform, https://coveralls.io/github/y...
node project uses node-coveralls + istanbul
finally shows icon

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.

I built a functional multi-tenant SaaS application (an EdTech app) with your everyday tech tool and you can do the same. First, what’s a multi-tenant SaaS application? Multi-tenant SaaS applications let you serve multiple customers from a sing

This article demonstrates frontend integration with a backend secured by Permit, building a functional EdTech SaaS application using Next.js. The frontend fetches user permissions to control UI visibility and ensures API requests adhere to role-base


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