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Pretty Slow / Ugly Fast: How to Optimize your Code in 19 Different Ways
- JavaScript, at its core, was architected with certain performance considerations in mind, but these considerations often get overshadowed by newer features designed for ease of use rather than efficiency.
- It is especially important in JavaScript to find a balance between elegance and performance, as sometimes beauty can come at a cost.
- This article explores 19 examples of TypeScript/JavaScript code patterns, comparing common, elegant approaches to their more optimized, but perhaps less attractive, counterparts.
- The author used a structured performance testing framework to measure execution time and memory usage at varying scales, revealing when certain optimizations kick in and how different environments can influence results.
- The article covers various topics such as string concatenation, array copying, looping over arrays, object property access, map usage, object cloning, and array filtering, among others.
- Some surprising results were found, such as destructuring being faster than dot notation in a simple performance test. Also, the spread operator was faster than using Object.assign() for object cloning.
- The article stresses the importance of testing performance trade-offs and not assuming that pretty code is always slower than ugly code.
- The conclusion is that there is no clear winner between pretty but slow and ugly but fast. The choice depends on the specific use case and balancing the trade-offs between performance and readability.
- Remember that the goal is to make more informed decisions when writing code, not to blindly assume that X is faster than Y. The only way to be 100% sure of your performance is to conduct your own tests.
- If you're not running performance tests or measuring results, then you probably don't care about performance as much as you think.
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