JavaScript Best Practices | Extraparse

JavaScript Best Practices

October 06, 202320 min read3956 words

Categories: TutorialJavaScript

Tags: JavaScriptBest PracticesMaintainable CodeTutorialProgrammingJavaScript Tutorial

Adopt best practices for writing clean, efficient, and maintainable JavaScript code. Comprehensive guide with tips and examples for mastering JavaScript best practices.

Table of Contents

Author: Extraparse

JavaScript Best Practices

Writing clean, efficient, and maintainable JavaScript code is pivotal for developing scalable and robust applications. Adhering to best practices enhances code readability, reduces bugs, and fosters seamless collaboration among developers.

What You'll Learn

  • Consistent Coding Style: Adopt a uniform coding style for enhanced readability and maintainability.
  • Use Strict Mode: Enable strict mode to catch common coding mistakes and enforce safer coding practices.
  • Avoid Global Variables: Implement strategies to minimize the use of global variables, preventing conflicts and unintended behaviors.
  • Prefer const and let Over var: Utilize modern variable declarations for better scoping and error prevention.
  • Modular Code: Structure code into small, reusable modules using functions and classes.
  • Descriptive Naming Conventions: Use clear and meaningful names for variables, functions, and classes to improve code comprehension.
  • Commenting and Documentation: Write meaningful comments and maintain proper documentation using tools like JSDoc.
  • Error Handling: Implement robust error handling to manage unexpected situations gracefully.
  • Optimize Performance: Write efficient code to enhance application performance.
  • Use Modern JavaScript Features: Leverage ES6+ features for cleaner and more expressive code.
  • Debugging Practices: Utilize debugging tools and techniques to identify and fix issues effectively.
  • Testing: Implement automated testing to ensure code reliability and correctness.
  • Best Practices Checklist: Follow a comprehensive checklist to ensure adherence to best practices.
  • Interactive Exercises: Engage in exercises and code reviews to apply and reinforce best practices.

Consistent Coding Style

Maintaining a consistent coding style improves readability and makes it easier for multiple developers to collaborate on the same codebase. A uniform style reduces cognitive load, allowing developers to focus on logic rather than syntax discrepancies.

  1. Indentation:

    • Spaces vs. Tabs: Prefer using spaces over tabs for indentation to maintain consistency across different editors.

    • Indent Size: Use a consistent number of spaces (commonly 2 or 4) for each indentation level.

      1// Example with 2 spaces
      2function greet() {
      3  console.log("Hello, World!");
      4}
      5

      6// Example with 4 spaces
      7function greet() {
      8  console.log("Hello, World!");
      9}

  2. Brace Style:

    • K&R Style: Opening braces are on the same line as the control statement. 
      1if (condition) {
      2  // code
      3} else {
      4  // code
      5}
    • Allman Style: Opening braces are on a new line. 
      1if (condition) {
      2  // code
      3} else {
      4  // code
      5}
    • Recommendation: Choose one brace style and apply it consistently throughout the codebase.

  3. Naming Conventions:

    • Variables and Functions: Use camelCase for naming variables and functions. 
      1let userName = "Alice";
      2function getUserData() {
      3  // code
      4}
    • Classes: Use PascalCase for class names. 
      1class UserProfile {
      2  // class definition
      3}
    • Constants: Use UPPER_SNAKE_CASE for constant values. 
      1const MAX_USERS = 100;

  4. Formatting Rules:

    • Line Length: Keep lines under 80 or 100 characters to enhance readability.

    • Semicolons: Decide whether to use semicolons consistently or employ a linter to manage them.

    • Spacing: Add spaces after keywords and around operators for clarity.

      1// Good
      2if (condition) {
      3  doSomething();
      4}
      5

      6// Bad
      7if (condition) {
      8  doSomething();
      9}

  5. Consistent Quotes:

    • Choose between single ' or double " quotes for strings and stick to the chosen style. 
      1let message = "Hello, World!";
      2let greeting = "Hello, World!";

Adopting these guidelines ensures that the codebase remains clean, readable, and maintainable, facilitating smooth collaboration and easier onboarding of new developers.

Use Strict Mode

Strict Mode is a feature in JavaScript that enforces a stricter parsing and error handling of your code. It helps in catching common coding mistakes and unsafe actions, making your code more robust and secure.

  1. Benefits of Strict Mode:

    • Catches Silent Errors: Throws errors for actions that are otherwise silently ignored, such as assigning to undeclared variables.
    • Prevents Accidental Globals: Disallows the creation of global variables without declarations.
    • Eliminates this Coercion: Ensures that this is undefined in functions where it would otherwise default to the global object.
    • Disallows Duplicate Property Names: Throws errors when object properties are duplicated.
    • Secures Code: Prevents the use of potentially confusing features and simplifies certain optimizations.

  2. How to Enable Strict Mode:

    • Globally: Enclosing the entire script in strict mode.

      1"use strict";
      2

      3function initialize() {
      4  // code here
      5}

    • Function Scope: Enclosing specific functions in strict mode.

      1function initialize() {
      2  "use strict";
      3  // code here
      4}

  3. Best Practices:

    • Always use strict mode in your JavaScript files or functions to enforce better coding standards.
    • Be aware of legacy code that might not be compatible with strict mode and refactor accordingly.

Avoid Global Variables

Minimizing the use of global variables is crucial to prevent conflicts and unintended behaviors, especially in large codebases or when integrating multiple libraries.

  1. Strategies to Minimize Global Variables:

    • Use Modules:

      • Leverage ES6 modules to encapsulate code, avoiding the need for global scope.

        1// math.js
        2export function add(a, b) {
        3  return a + b;
        4}
        5

        6// main.js
        7import { add } from "./math.js";
        8console.log(add(2, 3)); // 5

    • Immediately Invoked Function Expressions (IIFEs):

      • Encapsulate code within an IIFE to limit scope. 
        1(function () {
        2  let privateVar = "I am private";
        3  function privateFunction() {
        4    console.log(privateVar);
        5  }
        6  privateFunction();
        7})();

    • Namespaces:

      • Create a single global object to contain all variables and functions. 
        1const MyApp = {
        2  version: "1.0",
        3  init: function () {
        4    // initialization code
        5  },
        6};
        7MyApp.init();

  2. Benefits:

    • Reduces Risk of Name Collisions: Prevents different scripts from unintentionally overwriting each other's variables.
    • Enhances Code Maintainability: Makes the codebase easier to manage by avoiding a polluted global namespace.
    • Improves Readability: Clearly delineates the boundaries of different components or modules within the application.

  3. Best Practices:

    • Always declare variables with let or const to avoid accidental global declarations.
    • Encapsulate related functionalities within modules or classes.
    • Avoid attaching properties directly to the window object unless absolutely necessary.

Prefer const and let Over var

Modern JavaScript provides const and let for variable declarations, offering better scoping and reducing common pitfalls associated with var.

  1. Differences Between var, let, and const:

    • var:
      • Function-scoped.
      • Hoisted and initialized with undefined.
      • Allows re-declaration and reassignment.
    • let:
      • Block-scoped.
      • Hoisted but not initialized, resulting in a Temporal Dead Zone.
      • Allows reassignment but not re-declaration within the same scope.
    • const:
      • Block-scoped.
      • Must be initialized at declaration.
      • Disallows reassignment and re-declaration.
      • For objects and arrays, properties can still be modified.

  2. Why Prefer const and let:

    • Enhanced Readability: Clearly indicates whether a variable is meant to be reassigned (let) or not (const).
    • Reduced Errors: Prevents accidental reassignments and unintended behavior due to hoisting.
    • Better Maintainability: Makes the codebase easier to reason about by enforcing stricter variable usage.

  3. Usage Guidelines:

    • Default to const: Use const for all variables unless you know they need to be reassigned. 
      1const apiUrl = "https://api.example.com/data";
    • Use let for Reassignments: Use let when a variable's value needs to change. 
      1let counter = 0;
      2counter += 1;
    • Avoid Using var: Unless maintaining legacy code, stick to let and const for variable declarations.

  4. Examples:

    1// Using const
    2const MAX_USERS = 100;
    3

    4// Using let
    5let userCount = 0;
    6userCount++;
    7

    8// Avoid using var
    9var temp = "temporary";

Modular Code

Organizing your code into small, reusable modules enhances maintainability, scalability, and collaboration. Modular code allows developers to isolate functionality, making it easier to test and debug.

  1. Benefits of Modular Code:

    • Reusability: Modules can be reused across different parts of the application or in different projects.
    • Maintainability: Encapsulated modules make it easier to manage and update code without affecting other parts.
    • Namespace Management: Prevents global namespace pollution by encapsulating variables and functions.
    • Ease of Testing: Isolated modules are simpler to test individually, improving code reliability.

  2. Implementing Modular Code with ES6 Imports and Exports:

    • Exporting Modules:

      1// utils.js
      2export function add(a, b) {
      3  return a + b;
      4}
      5

      6export const pi = 3.1415;

    • Importing Modules:

      1// main.js
      2import { add, pi } from "./utils.js";
      3

      4console.log(add(2, 3)); // 5
      5console.log(pi); // 3.1415

  3. Using Default Exports:

    • Simplifies imports when a module exports a single functionality.

      1// logger.js
      2export default function log(message) {
      3  console.log(message);
      4}
      5

      6// main.js
      7import log from "./logger.js";
      8log("Hello, World!");

  4. Organizing Modules:

    • Feature-Based Structure: Group related modules based on functionality or features.
    • Layered Structure: Separate modules based on layers like data access, business logic, and presentation.

  5. Best Practices:

    • Keep modules focused on a single responsibility.
    • Use clear and consistent naming conventions for modules.
    • Avoid circular dependencies between modules.

Descriptive Naming Conventions

Using clear and descriptive names for variables, functions, and classes enhances code readability and makes it easier for developers to understand the code's intent without delving into implementation details.

  1. Variables:

    • Be Specific: Choose names that accurately describe the data they hold.

      1// Good
      2let userAge = 30;
      3

      4// Bad
      5let x = 30;

  2. Functions:

    • Describe Actions: Use verbs to indicate what the function does.

      1// Good
      2function calculateTotalPrice(items) {
      3  // implementation
      4}
      5

      6// Bad
      7function doSomething(items) {
      8  // implementation
      9}

  3. Classes:

    • Use Nouns or Noun Phrases: Reflect the entity or concept the class represents.

      1// Good
      2class ShoppingCart {
      3  // class definition
      4}
      5

      6// Bad
      7class Processor {
      8  // class definition
      9}

  4. Avoid Abbreviations:

    • Use Full Words: Unless the abbreviation is widely recognized.

      1// Good
      2const percentage = 75;
      3

      4// Bad
      5const pct = 75;

  5. Boolean Variables:

    • Use Prefixes Like is, has, or can: Clearly indicate that the variable is a boolean.

      1// Good
      2let isLoggedIn = true;
      3

      4// Bad
      5let loggedIn = true;

  6. Constants:

    • Reflect Immutability: Use names that imply constant values. 
      1const MAX_CONNECTIONS = 10;

  7. Best Practices:

    • Consistency: Stick to a consistent naming convention throughout the codebase.
    • Avoid Contextual Names: Don’t use vague names that depend on the wider context.
    • Meaningful Length: Balance between overly long and too short names to ensure clarity without verbosity.

Commenting and Documentation

Effective commenting and documentation are essential for understanding, maintaining, and scaling codebases. They provide insights into the code's purpose, functionality, and usage, facilitating better collaboration and future development.

  1. Types of Comments:

    • Inline Comments: Brief comments within the code to explain specific lines or logic. 
      1const total = price * quantity; // Calculate total price
    • Block Comments: Multiline comments to explain larger sections or complex logic. 
      1/*
      2  This function calculates the total price
      3  based on the item's price and quantity.
      4*/
      5function calculateTotalPrice(price, quantity) {
      6  return price * quantity;
      7}

  2. Documentation with JSDoc:

    • Purpose: Generate HTML documentation from specially formatted comments.
    • Syntax: 
      1/**
      2 * Adds two numbers together.
      3 * @param {number} a - The first number.
      4 * @param {number} b - The second number.
      5 * @returns {number} The sum of a and b.
      6 */
      7function add(a, b) {
      8  return a + b;
      9}
    • Benefits:
      • Automated Documentation: Easily generate and maintain up-to-date documentation.
      • Enhanced IDE Support: Many IDEs use JSDoc comments to provide better code hints and autocomplete features.

  3. Best Practices:

    • Avoid Redundant Comments: Don’t state the obvious; ensure comments add meaningful context.

      1// Bad
      2let count = 10; // Initialize count to 10
      3

      4// Good
      5// Initialize count based on the number of active users
      6let count = activeUsers.length;

    • Keep Comments Up-to-Date: Ensure that comments reflect the current state of the code to prevent misinformation.

    • Use Comments Sparingly: Rely on clear and self-explanatory code; use comments to explain why, not what.

  4. Providing Examples:

    • Code Examples in Documentation: Include usage examples to illustrate how to use functions or classes. 
      1/**
      2 * Initializes the user interface.
      3 * @example
      4 * initUI();
      5 */
      6function initUI() {
      7  // implementation
      8}

  5. Readable Documentation:

    • Organize documentation logically with sections, headings, and clear explanations.
    • Use markdown or other documentation formats to enhance readability.

Error Handling

Robust error handling ensures that applications can gracefully manage unexpected situations without crashing, providing a better user experience and easier debugging.

  1. Use Try-Catch Blocks:

    • Purpose: Handle exceptions and prevent the application from terminating unexpectedly. 
      1try {
      2  const data = fetchData();
      3  processData(data);
      4} catch (error) {
      5  console.error("An error occurred:", error);
      6}

  2. Throw Informative Errors:

    • Custom Errors: Create custom error messages to provide more context. 
      1function validateUser(user) {
      2  if (!user.name) {
      3    throw new Error("User name is required.");
      4  }
      5}

  3. Handle Promises and Async Operations:

    • Using .catch: Ensure that all promises have error handling. 
      1fetchData()
      2  .then((data) => processData(data))
      3  .catch((error) => console.error("Fetch error:", error));
    • Async/Await with Try-Catch: 
      1async function getData() {
      2  try {
      3    const data = await fetchData();
      4    processData(data);
      5  } catch (error) {
      6    console.error("Async fetch error:", error);
      7  }
      8}

  4. Graceful Degradation:

    • Provide fallback mechanisms when errors occur, ensuring that the application remains functional. 
      1function loadProfile() {
      2  try {
      3    const profile = getUserProfile();
      4    displayProfile(profile);
      5  } catch {
      6    displayDefaultProfile();
      7  }
      8}

  5. Logging:

    • Consistent Logging: Implement a consistent logging strategy to record errors for later analysis.
    • Use Logging Libraries: Utilize libraries like Winston or Bunyan for advanced logging features.

  6. Best Practices:

    • Don’t Suppress Errors: Avoid empty catch blocks; always handle or log errors appropriately.
    • Provide User Feedback: Inform users when something goes wrong without exposing sensitive information.
    • Clean Up Resources: Ensure that resources like file handles or network connections are properly closed in case of errors.
    • Avoid Overusing Exceptions: Use exceptions for exceptional cases and not for regular control flow.

Optimize Performance

Writing efficient code is crucial for enhancing application performance, ensuring a smooth user experience, and reducing resource consumption.

  1. Efficient DOM Manipulation:

    • Batch Updates: Minimize reflows and repaints by batching DOM updates.

      1// Inefficient
      2element.style.width = "100px";
      3element.style.height = "200px";
      4

      5// Efficient
      6Object.assign(element.style, {
      7  width: "100px",
      8  height: "200px",
      9});

  2. Avoid Memory Leaks:

    • Properly Remove Event Listeners: Ensure that event listeners are removed when no longer needed.

      1// Adding an event listener
      2element.addEventListener("click", handleClick);
      3

      4// Removing the event listener
      5element.removeEventListener("click", handleClick);

    • Manage References: Avoid keeping unnecessary references to objects, allowing garbage collection to reclaim memory.

  3. Efficient Looping:

    • Use Appropriate Loop Constructs: Choose the most efficient loop for the task.

      1// Using forEach vs. traditional for
      2array.forEach((item) => process(item));
      3

      4// For large datasets, a traditional for loop may be faster
      5for (let i = 0; i < array.length; i++) {
      6  process(array[i]);
      7}

  4. Minimize Computational Complexity:

    • Optimize Algorithms: Choose algorithms with lower time and space complexity.

      1// Inefficient: O(n^2)
      2for (let i = 0; i < items.length; i++) {
      3  for (let j = 0; j < items.length; j++) {
      4    // nested operations
      5  }
      6}
      7

      8// Efficient: O(n)
      9const processed = items.map((item) => process(item));

  5. Lazy Loading:

    • Defer Loading Non-Critical Resources: Load resources only when they are needed to reduce initial load times.

  6. Use Web Workers:

    • Offload Heavy Computation: Utilize web workers to run computationally intensive tasks without blocking the main thread.

  7. Best Practices:

    • Profile and Benchmark: Regularly profile your application to identify performance bottlenecks.
    • Optimize Asset Loading: Compress and minify assets to reduce load times.
    • Cache Data Appropriately: Implement caching strategies to minimize redundant data fetching.

Use Modern JavaScript Features

Leveraging ES6+ features leads to cleaner, more expressive, and efficient code. Modern JavaScript introduces syntax and functionalities that enhance development productivity and code quality.

  1. Arrow Functions:

    • Provide a concise syntax and lexically bind the this value.

      1// Traditional Function
      2function add(a, b) {
      3  return a + b;
      4}
      5

      6// Arrow Function
      7const add = (a, b) => a + b;

  2. Template Literals:

    • Enable embedded expressions and multi-line strings. 
      1const name = "Alice";
      2const greeting = `Hello, ${name}!`;

  3. Destructuring Assignment:

    • Extract values from arrays or properties from objects into distinct variables.

      1const user = { name: "Bob", age: 25 };
      2const { name, age } = user;
      3

      4const numbers = [1, 2, 3];
      5const [first, second] = numbers;

  4. Spread and Rest Operators:

    • Spread (...): Expand iterable elements. 
      1const arr1 = [1, 2];
      2const arr2 = [...arr1, 3, 4]; // [1, 2, 3, 4]
    • Rest (...): Collect multiple elements into an array. 
      1function sum(...numbers) {
      2  return numbers.reduce((total, num) => total + num, 0);
      3}

  5. Classes:

    • Provide a syntactical sugar over prototypes for object-oriented programming.

      1class Person {
      2  constructor(name) {
      3    this.name = name;
      4  }
      5

      6  greet() {
      7    console.log(`Hello, I'm ${this.name}`);
      8  }
      9}
      10

      11const alice = new Person("Alice");
      12alice.greet();

  6. Modules:

    • Facilitate code organization and reuse through import and export statements.

  7. Promises and Async/Await:

    • Simplify asynchronous programming with better readability and error handling.

      1// Using Promises
      2fetchData()
      3  .then((data) => processData(data))
      4  .catch((error) => console.error(error));
      5

      6// Using Async/Await
      7async function getData() {
      8  try {
      9    const data = await fetchData();
      10    processData(data);
      11  } catch (error) {
      12    console.error(error);
      13  }
      14}

  8. Best Practices:

    • Stay Updated: Continuously learn and adopt new features as the language evolves.
    • Use Babel or TypeScript: Transpile modern JavaScript features for broader browser compatibility if necessary.
    • Write Clean and Concise Code: Utilize modern features to reduce boilerplate and enhance clarity.

Debugging Practices

Effective debugging is essential for identifying and resolving issues in your code, ensuring application stability and reliability.

  1. Use Browser Developer Tools:

    • Console: Log messages and inspect variables. 
      1console.log("Variable value:", variable);
    • Debugger: Set breakpoints and step through code execution. 
      1debugger;

  2. Leverage Breakpoints:

    • Set conditional breakpoints to pause execution when specific conditions are met.
    • Use line-of-code breakpoints to inspect state at critical points.

  3. Utilize Source Maps:

    • Map minified or transpiled code back to the original source for easier debugging.

  4. Inspect Network Requests:

    • Use the Network panel to monitor API calls, response times, and data payloads.

  5. Analyze Call Stack:

    • Review the call stack to trace the sequence of function calls leading to an error.

  6. Use Logging Libraries:

    • Implement advanced logging solutions like Winston or Log4js for better log management.

  7. Best Practices:

    • Remove Debugging Code: Ensure that console.log statements and debugger statements are removed from production code.
    • Write Test Cases: Prevent bugs by writing tests that cover various scenarios.
    • Collaborate: Use pair programming or code reviews to gain different perspectives on potential issues.

Testing

Automated testing ensures code reliability and correctness by allowing developers to verify that code behaves as expected under various conditions.

  1. Types of Testing:

    • Unit Testing: Test individual units or components of the codebase.

      1// Example with Jest
      2const add = (a, b) => a + b;
      3

      4test("adds 1 + 2 to equal 3", () => {
      5  expect(add(1, 2)).toBe(3);
      6});

    • Integration Testing: Test the interactions between different modules or components.

    • End-to-End (E2E) Testing: Simulate real user scenarios to test the complete application flow.

  2. Testing Frameworks and Libraries:

    • Jest: A comprehensive testing framework with built-in assertions and mocking.
    • Mocha: A flexible testing framework that can be paired with assertion libraries like Chai.
    • Chai: An assertion library that works with Mocha for writing expressive tests.
    • Cypress: An E2E testing framework for testing web applications.

  3. Best Practices:

    • Write Testable Code: Design your code to be easily testable by adhering to the Single Responsibility Principle.
    • Maintain Test Coverage: Aim for high test coverage to ensure that most parts of the codebase are tested.
    • Use Mocks and Stubs: Isolate units by mocking dependencies, enabling focused and reliable tests.
    • Automate Testing: Integrate testing into your CI/CD pipeline to run tests automatically on code changes.
    • Write Descriptive Test Cases: Use clear and descriptive names for test cases to understand their purpose easily.

  4. Example with Jest:

    1// math.js
    2export function multiply(a, b) {
    3  return a * b;
    4}
    5

    6// math.test.js
    7import { multiply } from "./math.js";
    8

    9test("multiplies 2 * 3 to equal 6", () => {
    10  expect(multiply(2, 3)).toBe(6);
    11});

  5. Continuous Integration:

    • Use tools like GitHub Actions, Travis CI, or Jenkins to automate the running of tests on every commit or pull request.

Best Practices Checklist

Use the following checklist to review your code and ensure compliance with JavaScript best practices:

  1. Consistent Coding Style:

    • [ ] Consistent indentation (spaces vs. tabs, indent size).
    • [ ] Uniform brace style.
    • [ ] Clear and descriptive naming conventions.
    • [ ] Proper use of semicolons and quotes.

  2. Strict Mode:

    • [ ] Enabled strict mode in scripts or functions.
    • [ ] No usage of deprecated or unsafe JavaScript features.

  3. Variable Declarations:

    • [ ] Use const for variables that don’t change.
    • [ ] Use let for variables that require reassignment.
    • [ ] No use of var.

  4. Scope Management:

    • [ ] Avoided global variables by using modules or IIFEs.
    • [ ] Variables are declared in the smallest appropriate scope.

  5. Modular Code:

    • [ ] Code is organized into reusable modules.
    • [ ] Proper use of import and export statements.

  6. Descriptive Naming:

    • [ ] Variables, functions, and classes have meaningful names.
    • [ ] Boolean variables use prefixes like is, has, or can.

  7. Commenting and Documentation:

    • [ ] Critical sections of code are well-commented.
    • [ ] JSDoc comments are used for functions and classes.
    • [ ] Documentation is up-to-date and comprehensive.

  8. Error Handling:

    • [ ] Implemented try-catch blocks where necessary.
    • [ ] Errors are handled gracefully with informative messages.

  9. Performance Optimization:

    • [ ] Avoided unnecessary computations and DOM manipulations.
    • [ ] Implemented efficient algorithms and data structures.

  10. Modern JavaScript Features:

    • [ ] Utilized ES6+ features for cleaner code.
    • [ ] Avoided outdated syntax and practices.

  11. Debugging:

    • [ ] Removed all console.log and debugger statements from production code.
    • [ ] Used debugging tools effectively to troubleshoot issues.

  12. Testing:

    • [ ] Automated tests are in place with adequate coverage.
    • [ ] Tests are passing consistently.
    • [ ] New features include corresponding test cases.

  13. Documentation and Readability:

    • [ ] Code is easy to read with logical structure.
    • [ ] Documentation is clear and helpful for new developers.

Interactive Exercises

Engage in the following exercises to apply and reinforce the best practices discussed:

  1. Refactor a Codebase:

    • Take a legacy JavaScript file and refactor it to adhere to modern best practices, including using const and let, implementing strict mode, and modularizing the code.

  2. Implement Error Handling:

    • Enhance a provided function by adding comprehensive error handling using try-catch blocks and informative error messages.

  3. Write Unit Tests:

    • Given a set of functions, write unit tests using Jest to ensure their correctness under various scenarios.

  4. Optimize Performance:

    • Analyze a slow-performing function and optimize its performance by improving its algorithm and reducing computational complexity.

  5. Create Documentation:

    • Use JSDoc to document a module, including descriptions of its functions, parameters, and return values.

  6. Code Review:

    • Participate in a peer code review session, evaluating code for adherence to best practices and providing constructive feedback.

By actively engaging with these exercises, you can solidify your understanding of JavaScript best practices and improve your coding skills effectively.

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Author: Extraparse

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