I'm not trying to restart debate on this, but I do know CoffeeScript allows it. It does a greedy grab, but it only allows a single spread element, and default parameters take full precedence over rest parameters in what is taken. [1]
As for optimization, that's probably the bigger issue. It's not very easily optimizable in my experience, even statically (much less at runtime). The code I usually have to write in those cases gets ugly in a hurry, and it's not a common use case. Example (it's LiveScript, which also has this, equivalent (not compiled) ES5, and equivalent ES6): [2]. Obviously, in that example, the ES5 version is a little out of hand, using array hacks in the name of speed, but the ES6 version isn't exactly pretty, and that isn't even as focused on engine speed. If you want to optimize this, good luck. The ES5 version isn't that far off of what low-level hacks would be needed to make it efficient. Note that LiveScript does exactly the same thing as CoffeeScript in this case. [1] http://coffeescript.org/#try:f%20%3D%20%28a%2C%20b...%2C%20c%29%20-%3E%0A%20%20alert%20[a%2C%20b%2C%20c].join%20%27%20%27%0A%0Af%20%27Hello%27%2C%20%27my%27%2C%20%27world%27 [2] https://gist.github.com/impinball/0ea14936a1680065a3a3 On Sat, Oct 3, 2015 at 3:50 AM, Michaël Rouges <[email protected]> wrote: > I understand better now ... Thanks a lot again... > > And, sorry, Tab... to not deal with you on already debated topics. > > I hope the following will not be one. > > > Michaël Rouges - https://github.com/Lcfvs - @Lcfvs > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss > -- Isiah Meadows _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
