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Muhammad Harith Zainudin
Muhammad Harith Zainudin

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Difference between Lodash Concat and Javascript Native Concat

Concat function in Lodash will creates a new array that concat the array with any additional arrays and/or values.
It will not change the original array.

It's easy to use and simple.
Same goes to the Javascript native concat method. But what's the difference between this 2 method?
Well obviously, one is using libraries (Lodash), and another one is Javascript original concatenation.

The syntax also different. BUT, the native Javascript concat win. Let me show you.

I've run the test 5 times in a row, with about 1-2 seconds of interval and this is the result

Running Native concat first, then lodash concat

Test Native Concat Lodash Concat Differences
1 0.318ms 0.179ms ✅ 0.139ms
2 0.097ms ✅ 0.16ms -0.063ms
3 0.094ms ✅ 0.159ms -0.065ms
4 0.094ms ✅ 0.16ms -0.066ms
5 0.09ms ✅ 0.158ms -0.068ms

Running Lodash concat first and then native concat.

Test Lodash Concat Native Concat Differences
1 0.525ms 0.009ms ✅ 0.516ms
2 0.237ms 0.008ms ✅ 0.229ms
3 0.247ms 0.008ms ✅ 0.239ms
4 0.259ms 0.008ms ✅ 0.251ms
5 0.25ms 0.008ms ✅ 0.242ms

With obvious result, native javascript concat wins. This is only using small dataset. With big dataset, surely it will tak e more time to process. Although the result is sub-milliseconds, the timing is important to make our apps run faster.

I'm not saying do not use Lodash concat, but hey, if we have already concat method in built with javascript, it's better to use it. Unless you have other reason to use lodash concat function and your applications don't really care about response time.

Some of Lodash function do actually make our life easier. It is useful and it makes the development much easier and faster as we do not have to implement a complex logic to get the result. So, it is up to you!

We will try to cover up more of the differences between lodash and inbuilt function so that we can have a look later on!

Thank you for reading :D
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