Refactor Your lodash Filter Function for Cleaner Code

Описание: Discover how to abstract your `lodash` filter function to avoid code repetition in your TypeScript components!
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This video is based on the question https://stackoverflow.com/q/66685597/ asked by the user 'manuelBetancurt' ( https://stackoverflow.com/u/523507/ ) and on the answer https://stackoverflow.com/a/66685758/ provided by the user 'Linda Paiste' ( https://stackoverflow.com/u/10431574/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Refactor Your lodash Filter Function for Cleaner Code

When working with JavaScript or TypeScript, code repetition can quickly lead to maintenance headaches and increased potential for bugs. In this post, we’ll tackle a common problem: how to abstract a lodash filter function so that it doesn’t get repeated across your components. Let’s dive into the details!

The Problem

You may find yourself using lodash's filter function multiple times within your components, as shown in the following example:

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In this code, we can see the same filtering logic applied to two different datasets, loanLimitData and loanBalanceData. This repetition not only makes the code longer but also harder to maintain.

The Solution

The solution is simple: create a reusable filtering function. By taking the array as an argument, you can streamline your code and eliminate repetition.

Creating the Filter Function

Here's how to create a generic filter function that can be used for any array:

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Explanation

Generic Function: The function is defined with a generic type T, meaning it can accept arrays of any type.

lodash Filter: The _.filter method filters the incoming array based on the provided criteria (keys not equal to 0 or 6).

Alternative Using Built-In JavaScript Method

If you prefer to use the built-in JavaScript method, you can achieve a similar result like this:

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This version uses the native Array.prototype.filter method and yields the same result as the lodash implementation.

Using the Filter Function in Your Components

Now that you've defined your filter function, you can make your components much cleaner. Here’s how to apply it:

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By replacing the repeated _.filter calls with myFilter(), your code is now significantly more maintainable and concise.

Conclusion

By abstracting your lodash filter function, you can avoid repetitive code and improve clarity throughout your components. This not only enhances your application's readability but also reduces possible sources of errors when changes are needed.

Start implementing this approach today and enjoy cleaner and more efficient code!