[].map() vs _.map()

Here, I try to performance benchmark the speed complexity of the native ES6 Array.map() over the famous lodash library's _.map(Array) function. The results were quite surprising to say the least.

Running the Test

$ node test

Reading the Output

Mapping over an Array of 1,000 objects:

		ES6		Lodash
Time Elapsed	0.037 ms	0.040 ms

Mapping over an Array of 10,000 objects:

		ES6		Lodash
Time Elapsed	0.159 ms	0.159 ms

Mapping over an Array of 100,000 objects:

		ES6		Lodash
Time Elapsed	11.870 ms	1.701 ms

Mapping over an Array of 1,000,000 objects:

		ES6		Lodash
Time Elapsed	120.790 ms	16.513 ms

Conclusion

We don't tend to see much of a difference with really small arrays (< 10,000 objects), but when it really gets large, which is a rare case on the frontend, lodash seems to be performing better than ES6's own native .map function.

If you feel like I have performed the test incorrectly, or you have any other metrics which can be shared, then please fork this repo, make your suggested changes and make a pull request.