Скачать или смотреть Efficiently Loop Through an Array in React with a Single Map

Learn how to avoid looping multiple times over the same array in React and JSX by optimizing your code using a single map function. Discover tips for creating a timeline structure effortlessly!
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This video is based on the question https://stackoverflow.com/q/73874726/ asked by the user 'Leo' ( https://stackoverflow.com/u/2011238/ ) and on the answer https://stackoverflow.com/a/73875357/ provided by the user 'Arifur Rahaman' ( https://stackoverflow.com/u/20097686/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Avoid Looping Multiple Times the Same Array in React and JSX

When developing applications with React, you might find yourself dealing with arrays of objects frequently. A common scenario is needing to extract different properties from the same array to generate separate lists in your JSX. However, looping through an array multiple times can lead to performance issues, especially with large datasets. In this post, we will tackle how to efficiently manage array mapping by utilizing a single loop.

The Challenge

Let's start with an example. Suppose we have the following array of objects representing years and corresponding text:

[[See Video to Reveal this Text or Code Snippet]]

We require this data to create a timeline structure in our component, consisting of separate lists for years and text:

[[See Video to Reveal this Text or Code Snippet]]

The Traditional Approach

A common but inefficient method would be to loop through the array twice:

[[See Video to Reveal this Text or Code Snippet]]

This approach works, but it can be optimized. By looping through the same array multiple times, you not only introduce redundancy but also potentially hinder performance.

The Optimized Solution: Single Loop Method

To avoid this issue, we can achieve the same result using just one iteration of the array. Let’s refactor our approach. Instead of using map, we can use forEach to push elements into two lists in one go.

Step-by-Step Implementation

Initialize Lists: Create empty arrays to hold your year and text elements.

Single Loop with forEach: Iterate through itensArray, and for each item, push the appropriate JSX elements to each list.

Here's how the code looks using this optimized approach:

[[See Video to Reveal this Text or Code Snippet]]

Breaking Down the Code

Initialization: We set up two empty arrays yearsList and textList.

Iteration: We use forEach to loop through each item in itensArray.

Push Elements: For each item, we create a list item for both year and text and push them into their respective arrays.

Rendering: Finally, we return the JSX with the populated lists.

Conclusion

By adopting this method, you efficiently avoid the performance hit that comes with looping through the same array multiple times. This approach not only enhances the performance of your React application but also keeps the code clean and easier to maintain. So next time you find yourself needing to extract information from an array, remember to optimize your loops!

Now you have an efficient solution for displaying values from arrays in React by leveraging a single loop. Happy coding!