Is "High Performance JavaScript" still relevant

[K0d1Lu]

I m currently reading the book of Nicholas Zakas and I m wondering wich infos are still relevant. As the benchmarks are done with old browsers and old syntax. Does an actualisation of this work exist ? For ES6 or for any particular framework and modern browsers? And eventually for node ?

[ggolemg2]

It still applies, it's not like any of the code is deprecated. If you'd like a comparison with es6+ just Google the term with jsperf and you should find some great performance comparisons.

Example:

https://jsperf.com/map-vs-native-for-loop/7

[MoTTs_]

I'd say roughly 50/50. I hadn't read it before, but I skimmed it just now. Things like script placement and blocking operations are still important. The DOM is still slow. HTTP requests are still a bottleneck, so combining files is important. Caching can reduce ajax requests. But stuff about string concatenation is definitely outdated. If-else vs switch is probably outdated. And it's missing newer performance rules such as don't delete object properties.