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How do you ensure JavaScript code is consistent and high quality?

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JavaScript is a powerful and popular programming language for front-end development, but it can also be tricky and error-prone. To write consistent and high quality JavaScript code, you need to follow some best practices and use some tools that can help you avoid common pitfalls and improve your code readability, performance, and maintainability. In this article, you will learn how to do that by applying these six techniques:

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Mahadi Riyadh

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1 Use strict mode

Strict mode is a feature of JavaScript that enforces stricter rules and prevents some common errors, such as using undeclared variables, assigning to read-only properties, or deleting non-deletable objects. To enable strict mode, you need to add the statement 'use strict'; at the beginning of your script or function. Strict mode can help you write cleaner and more secure code, and also make it easier to debug and optimize.

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Mahadi Riyadh

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I just couldn’t agree more. ‘use strict’ is something we can use to overcome a lot of upcoming errors and bugs. So it is always a good practice to write JS code in strict mode. Specially if you are in production environment you just should not avoid it.

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2 Follow a style guide

A style guide is a set of rules and conventions that define how to format and structure your code, such as indentation, spacing, naming, comments, and syntax. Following a style guide can help you write consistent and readable code, and also avoid some common errors and bugs. There are many style guides available for JavaScript, such as Airbnb, Google, or Standard. You can choose one that suits your preferences and project needs, or create your own. You can also use tools like Prettier or ESLint to automatically format and lint your code according to a style guide.

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Mahadi Riyadh

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Definitely, we should always use a style guide whenever possible. Although it might be overwhelming for beginners or newbie’s, so I would suggest if you are just starting out you can skip this part and start thinking more about it once you get to intermediate level. But don’t get me wrong here, you must learn how to use a style guide properly in your code to thrive in your technical career.

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3 Use modern features

JavaScript is constantly evolving and adding new features and syntax that can make your code more concise, expressive, and functional. For example, you can use arrow functions, template literals, destructuring, spread and rest operators, default parameters, and async/await to write more elegant and efficient code. However, not all browsers or environments support the latest features, so you may need to use a transpiler like Babel or TypeScript to convert your code to a compatible version.

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Mahadi Riyadh

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JavaScript’s new features comes very handy when writing code for large projects. As new features comes with a lot of improvements, it’s essential for us to have a good grasp on those new concepts as well.

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4 Write modular code

Modular code is code that is divided into small and independent units, called modules, that can be reused, tested, and maintained separately. Writing modular code can help you organize your code better, avoid repetition and duplication, and make it easier to debug and scale. You can use the native module system of JavaScript, which uses the keywords import and export to load and export modules, or use a module bundler like Webpack or Rollup to bundle your modules into a single file.

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5 Test your code

Testing your code is essential to ensure that it works as expected, meets the requirements, and does not contain any errors or bugs. Testing your code can also help you improve your code quality, design, and performance, and make it more reliable and secure. You can use different types of testing, such as unit testing, integration testing, or end-to-end testing, depending on the scope and complexity of your code. You can also use testing frameworks and tools like Jest, Mocha, or Cypress to write and run your tests.

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6 Refactor your code

Refactoring your code is the process of improving your code without changing its functionality, by applying changes such as renaming variables, simplifying logic, removing dead code, or extracting functions. Refactoring your code can help you make your code more readable, maintainable, and extensible, and also fix some hidden errors or bugs. You can refactor your code manually, or use tools like VS Code, WebStorm, or Codemod to automate some of the tasks.

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7 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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How do you ensure JavaScript code is consistent and high quality?

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2

3

4

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1 Use strict mode

2 Follow a style guide

3 Use modern features

4 Write modular code

5 Test your code

6 Refactor your code

7 Here’s what else to consider

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