The benchmarks proved that imperative programming with loops results in better performance than using convenient Array methods. The tests again showed no difference between the loops. So unless the performance is that critical. Writing that many code lines for just a simple sum must have a strong reason, Input for the tests was an array of one million objects with the structure return result The test application uses the benchmark library to get statistically significant results.

We would love your feedback and contributions! Still, when processing large amounts of data in some business intelligence app, video processing, scientific calculations, or game engine, this will have a massive effect on the overall performance.

It doesn’t add up to a significant difference in most applications. Loops are usually three or more times faster than their declarative counterparts. It’s better 99% of the time, but not when performance matters. forEach Array methods over simple loops in JavaScript?”ĭeclarative programming style is very expressive, easier to write, and far more readable. While we partially agree, that got us thinking: He explained that he writes only declarative code, and there’s no point in imperative programming anymore. Once, we interviewed a mid-developer position candidate that couldn’t answer a simple question involving the while loop.

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