[jackmott42]

There can be value in "things will be fast by default" vs "things can be fast if you use a careful subset of the language". As well it is nice not to have to depend on v8 being the runtime to get good performance.

One thing I appreciate about say, Rust, vs C# is that in both using iterators to do operations on collections is the standard idiomatic thing to do. However in C# there is always some overhead, and at big scale you have to question whether that overhead is ok here. Usually is fine but sometimes you have to drop back to for loops.

With Rust the iterators pretty reliably get compiled down to very efficient code. So you just do the usual easy thing and get the good performance, no need to worry about it.

[jhgb]

> There can be value in "things will be fast by default" vs "things can be fast if you use a careful subset of the language".

One could equally say that there's value in "things will be general by default" vs "things can be general if you use obscure features of a language and thirty libraries to generalize the things that aren't general yet".

Yet most programs seem to be following the 80/20 rule, so the majority of code that has been ever written seems to prefer generality over raw speed. Of course one possible solution is to write the general parts and the fast parts of your program in different languages, but interoperation may be tedious.