{"id":1063,"date":"2024-07-02T09:21:00","date_gmt":"2024-07-02T07:21:00","guid":{"rendered":"http:\/\/uniquedevs.mariuszptaszek.pl\/blog\/najlepsze-praktyki-w-pisaniu-czystego-kodu-javascript\/"},"modified":"2024-10-24T18:58:33","modified_gmt":"2024-10-24T16:58:33","slug":"best-practices-in-writing-clean-javascript-code","status":"publish","type":"post","link":"https:\/\/uniquedevs.com\/en\/blog\/best-practices-in-writing-clean-javascript-code\/","title":{"rendered":"JavaScript clean coding best practices &#8211; checklist"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Why clean code matters for web development?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Writing clean code is essential for web development projects, especially as applications grow in complexity and scale. Clean code makes it easier for developers to understand and modify the codebase, improves collaboration, enhances performance, and reduces bugs and technical debt. By following clean code principles, developers can ensure that their code is maintainable, scalable, and efficient. Clean code practices are the foundation of a robust and reliable codebase, which makes it easier to onboard new team members and ensures that projects can evolve smoothly over time.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Below are 12 best and proven practices to make Javascriop code understandable and readable.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">1. Consistent formatting<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Use consistent indentation, spacing, and naming conventions throughout your code. Popular conventions include CamelCase for variables and functions and kebab-case for filenames.<\/p>\n\n\n\n<pre class=\"wp-block-code language-js\"><code>\/\/ Variables and functions in CamelCase\nconst userAge = 25;\nconst maxUserLimit = 100;\n\nfunction calculateTotalPrice(itemPrice, quantity) {\n    return itemPrice * quantity;\n}\n\n\/\/ Helper function, used in getUserDetails\nfunction findUserById(userId) {\n    \/\/ Example implementation\n    const users = &#91;\n        { id: 1, name: 'Alice', age: 30 },\n        { id: 2, name: 'Bob', age: 25 }\n    ];\n    return users.find(user => user.id === userId);\n}\n\n\/\/ Using indentation and spacing\nfunction getUserDetails(userId) {\n    if (!userId) {\n        return null;\n    }\n\n    const user = findUserById(userId);\n    if (!user) {\n        return null;\n    }\n\n    return {\n        id: user.id,\n        name: user.name,\n        age: user.age\n    };\n}\n\n\/\/ File names in kebab-case\n\/\/ example files: user-profile.js, calculate-total-price.js<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">2. Descriptive names for variables and functions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Choose meaningful and descriptive names for variables, functions, and classes. This makes your code easier to understand.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Good variable name:<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code language-js\"><code>const maxUserLimit = 100;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Good function name:<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code language-js\"><code>function generateReportData(reportType, startDate, endDate) { \/* ... *\/ }<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Bad variable name:<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code language-js\"><code>const x = 100;<\/code><\/pre>\n\n\n\n<p class=\"language-js wp-block-paragraph\"><strong>Bad function name:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code language-js\"><code>function foo(a, b) { \/* ... *\/ }<\/code><\/pre>\n\n\n\n<p class=\"language-js wp-block-paragraph\">Choosing descriptive names is key to keeping code readable. Good names communicate the purpose of a piece of code, making it easier to maintain. Additionally, it is important to use modern JavaScript practices by advocating for the use of <code>let<\/code> and <code>const<\/code> instead of <code>var<\/code>. This approach enhances readability, ensures block scoping, and minimizes potential runtime errors, thereby improving code reliability.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. Avoiding global scope pollution<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Using global variables can cause conflicts and hard-to-debug issues. Always use <code>let<\/code> and <code>const<\/code> to define local variables within their scope. When necessary, use Immediately Invoked Function Expressions (IIFE) to create isolated scopes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Example:<\/p>\n\n\n\n<pre class=\"wp-block-code language-js\"><code>(function() {\n    const localVar = \"This is local and safe\";\n})();\n\/\/ localVar is not accessible here<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">4. Add comments to explain blocks of code<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Comments play a key role in writing good code. They make it easier to understand what a piece of code does and why it was written a certain way.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Be sure to comment on all relevant parts of the code, not just those that may be difficult to understand. Well-placed comments can significantly speed up the debugging process and make future modifications easier. However, strive for <strong>self-documenting code<\/strong> first\u2014your code should be clear enough that extensive comments are not needed. Use comments to explain the <strong>why<\/strong> rather than the <strong>what<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Example:<\/p>\n\n\n\n<pre class=\"wp-block-code language-js\"><code>\/**\n* Fetches user details from the database.\n* @param {number} userId - The ID of the user.\n*\/\nfunction fetchUserDetails(userId) {\n    \/\/ Fetching user details from API\n    \/\/ The userId must be greater than 0\n    if (userId &lt;= 0) throw new Error(\"Invalid user ID\");\n    \/\/ ... implementation\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">5. Write modular code that can be reused<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Divide your code into smaller, reusable modules or functions. This promotes code reuse and helps manage complexity. Modularizing your code also prevents duplication\u2014if you create a universal function, you can easily apply it to different parts of the project.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Example:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code language-js\"><code>function calculateArea(width, height) {\n    return width * height;\n}\n\nfunction calculateVolume(width, height, depth) {\n    return calculateArea(width, height) * depth;\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Modular code allows for single-responsibility functions, making your code more maintainable.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">6. Best practices for asynchronous code<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Use <code>async\/await<\/code> to handle asynchronous operations instead of deeply nested callbacks (i.e., callback hell) or complex Promise chains. Always use <code>try...catch<\/code> blocks to manage errors in async functions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Example:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code language-js\"><code>async function fetchData() {\ntry {\nconst response = await fetch('https:\/\/api.example.com\/data');\nconst data = await response.json();\nconsole.log(data);\n} catch (error) {\nconsole.error('Failed to fetch data:', error);\n}\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Using <code>async\/await<\/code> makes asynchronous code look and behave more like synchronous code, improving readability.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">7. Avoiding code smells and anti-patterns<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Code smells are symptoms of deeper problems in your codebase. Examples of code smells include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Magic Numbers<\/strong>: Use named constants instead of hard-coded numbers.<\/li>\n\n\n\n<li><strong>Overuse of Global Variables<\/strong>: Limit globals as they can lead to bugs and make maintenance harder.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Example:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code language-js\"><code>\/\/ Bad practice\nif (user.age > 21) {\n    \/\/ do something\n}\n\n\/\/ Good practice\nconst LEGAL_AGE = 21;\nif (user.age > LEGAL_AGE) {\n    \/\/ do something\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Named constants make the purpose of numbers clear and improve readability.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">8. Comprehensive error handling<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Proper error handling is crucial for building reliable software. Use <code>try...catch<\/code> blocks to manage errors and, where necessary, create custom error classes for better error differentiation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Example:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code language-js\"><code>class CustomError extends Error {\n    constructor(message, statusCode) {\n        super(message);\n        this.statusCode = statusCode;\n    }\n}\n\ntry {\n    throw new CustomError(\"Resource not found\", 404);\n} catch (error) {\n    if (error instanceof CustomError) {\n        console.error(`Custom error occurred: ${error.message}, Status: ${error.statusCode}`);\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Custom error classes help differentiate between various error types, which allows for more nuanced error handling.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">9. Testing javaScript code<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Testing is an essential part of writing reliable code. Use testing frameworks like <strong>Jest<\/strong> or <strong>Mocha<\/strong> to create unit tests, ensuring that your functions behave as expected.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Example:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code language-js\"><code>\/\/ Using Jest for unit testing\nfunction sum(a, b) {\n    return a + b;\n}\n\nmodule.exports = sum;\nconst sum = require('.\/sum');\n\ntest('adds 1 + 2 to equal 3', () => {\n    expect(sum(1, 2)).toBe(3);\n});<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Testing ensures your code is stable and makes it easier to refactor without introducing bugs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">10. Avoid irrelevant classes and understand hoisting<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Avoid creating unnecessary classes. Only use classes when the object-oriented model is necessary. Additionally, understand that classes are <strong>not hoisted<\/strong> like functions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Example:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code language-js\"><code>\/\/ Bad practice\nconst hat = new Product(\"red hat\", 1000); \/\/ ReferenceError\nclass Product {\n    constructor(name, price) {\n        this.name = name;\n        this.price = price;\n    }\n}\n\n\/\/ Correct order\nclass Product {\n    constructor(name, price) {\n        this.name = name;\n        this.price = price;\n    }\n}\nconst hat = new Product(\"red hat\", 1000);<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Always declare classes before you use them.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">11. Use libraries and frameworks<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Using libraries and frameworks is crucial for writing clean and readable JavaScript code. Tools like <strong>Lodash<\/strong> and frameworks like <strong>React<\/strong> or <strong>Vue.js<\/strong> can help enforce standards, promote modularization, and avoid reinventing the wheel.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Example with Lodash:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code language-js\"><code>const _ = require('lodash');\n\nconst users = &#91;\n    { user: 'Alice', age: 25 },\n    { user: 'Bob', age: 30 }\n];\n\nconst sortedUsers = _.sortBy(users, &#91;'age']);\nconsole.log(sortedUsers);<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Libraries save time and help avoid errors by leveraging community-tested solutions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">12. Refactoring techniques<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Refactoring keeps your code clean over time. Techniques like <strong>extracting functions<\/strong>, <strong>renaming variables<\/strong>, and <strong>removing duplication<\/strong> help maintain the quality of the codebase.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Example:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code language-js\"><code>\/\/ Original code\nfunction processUserData(user) {\n    \/\/ Get full name\n    const fullName = `${user.firstName} ${user.lastName}`;\n    \/\/ Log welcome message\n    console.log(`Welcome, ${fullName}!`);\n}\n\n\/\/ Refactored code\nfunction getFullName(user) {\n    return `${user.firstName} ${user.lastName}`;\n}\n\nfunction logWelcomeMessage(user) {\n    console.log(`Welcome, ${getFullName(user)}!`);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Refactoring code makes it more modular, easier to test, and more maintainable over time.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">FAQ \u2013 Frequently Asked Questions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What tools can I use to ensure the cleanliness and consistency of my JavaScript code?<\/strong><br>Use tools like ESLint for linting and Prettier for code formatting. They help ensure consistency and prevent common mistakes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How can I improve the performance of my JavaScript code while maintaining readability?<\/strong><br>Use debouncing, throttling, and optimize loops. Minimize direct DOM manipulations and use requestAnimationFrame for smoother animations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What are the best practices for code organization in large JavaScript projects?<\/strong><br>Follow modularization practices, use helper functions, and adopt the <strong>stepdown rule<\/strong> to structure code in a natural, readable order.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How do I ensure that my JavaScript code is well tested?<\/strong><br>Use testing frameworks like Jest, Mocha, or Cypress. Follow TDD (Test-Driven Development) to ensure your code is thoroughly tested before integrating new features.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Why is clean Javascript code so important? First, it makes your code easier for others to understand. This is a huge advantage, especially if you work in a team. Second, clean javascrip t code is easier to maintain and debug. When everything is well organized, it&#8217;s easier to find and fix bugs. Modern JavaScript features, such as Promises and async\/await, play a crucial role in writing clean and maintainable code by simplifying asynchronous code management. In the following article, we will present best practices in writing clean and understandable javascript code.<\/p>\n","protected":false},"author":2,"featured_media":4993,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[17],"tags":[],"class_list":["post-1063","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-front-end"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Best practices in writing clean code Javascript | UniqueDevs<\/title>\n<meta name=\"description\" content=\"Clean Javascript code is really important. First, it makes your code easier for others to understand. This is a huge advantage, especially if you work in a team. Second, clean javascrip code is easier to maintain and debug. 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