Re: Add support for arbitrary code inside template tags without the 'do' keyword

A use I thought up (although I got lazy and abandoned it later) was an `exec` template tag, for executing commands. Or, and this just came off the to of my head, you could use it as a vdom library as almost like a Lisp reader macro: ```js n`.form-ctrl`( n`input#input`("input"),

Re: Add support for arbitrary code inside template tags without the 'do' keyword

> modulo the obvious mistake Oops. x] > you could use it as a vdom library as almost like a Lisp reader macro: That would be interesting. There's still lots of runtime processing though. Maybe a build-time tool can also optimize it though, but if it happens to be executed at runtime it'll just

Re: Add support for arbitrary code inside template tags without the 'do' keyword

Problem is: your idea has already been tried and found to be pretty slow. React devs did briefly consider this, but found that it had fundamental speed limitations. And precompilation is already happening with existing templates, even though building them normally is still cheap to do.

Re: Add support for arbitrary code inside template tags without the 'do' keyword

That link details other reasons, such as tooling. On Wed, Jan 13, 2016, 18:11 Isiah Meadows wrote: > Problem is: your idea has already been tried and found to be pretty slow. > React devs did briefly consider this, but found that it had fundamental > speed limitations.

Re: Add support for arbitrary code inside template tags without the 'do' keyword

Interesting! On Wed, Jan 13, 2016 at 3:12 PM, Isiah Meadows wrote: > That link details other reasons, such as tooling. > > > On Wed, Jan 13, 2016, 18:11 Isiah Meadows wrote: >> >> Problem is: your idea has already been tried and found to be pretty

Re: Add support for arbitrary code inside template tags without the 'do' keyword

The two code samples you posted are equivalent (modulo the obvious mistake). AFAIU there is still only a single parsing pass for template strings. On Tuesday, 12 January 2016, /#!/JoePea wrote: > The thing with template strings is that they are used at runtime. This > could be

Re: Re: Add support for arbitrary code inside template tags without the 'do' keyword

The thing with template strings is that they are used at runtime. This could be slow if we're compiling things at runtime all the time, whereas a server-side templating solution might lead JavaScript functions compiled from templates (like in the case with Meteor Blaze Spacebars or React JSX),

Re: Add support for arbitrary code inside template tags without the 'do' keyword

> The idea to develop in native way a good templating engine is exciting and I'm looking forward for its complete implementation :) This topic arose in an earlier thread that I'm too lazy to track down. Some insane person from Microsoft? actually showed us how to write ifs and everything using

Re: Add support for arbitrary code inside template tags without the 'do' keyword

> Watch your precedence, Caitlin. You'll need to wrap that arrow in parentheses > like so: Yes, I guess arrow functions aren’t a PrimaryExpression — doesn’t really matter, though > On Jan 10, 2016, at 11:58 PM, Michael Ficarra > wrote: > > Watch your precedence,

Re: Re: Add support for arbitrary code inside template tags without the 'do' keyword

Yes Bob, after a personal testing with a complete template engine using the ES6 template strings, I realized that their use (in mine use case, of course) is slowest than the approach that I'm using right now (like the Underscore template). Thanks everyone :)

Add support for arbitrary code inside template tags without the 'do' keyword

Hi, I asked around and somebody said that there will be the possibility to execute arbitrary code inside the template tags, using the *'do'* keyword in this example way: `Hello ${ do if (a == 2) { > console.log(' world'); > } }` Is there the possibility in future to implement

Re: Add support for arbitrary code inside template tags without the 'do' keyword

Do-Expressions are still floating around Stage 0, there’s no guarantee that they will be incorporated into the language. The feature is implemented in v8 behind a flag, and can be used in Chrome Canary by launching the browser with `—js-flags=“—harmony-do-expressions”`, which would enable you

Re: Add support for arbitrary code inside template tags without the 'do' keyword

Watch your precedence, Caitlin. You'll need to wrap that arrow in parentheses like so: ```js `Hello ${(_ => { if (a == 2) { console.log(‘world’); } })()}`; ``` Michael On Sun, Jan 10, 2016 at 7:12 PM, Caitlin Potter wrote: > Do-Expressions are still floating

Re: Re: Add support for arbitrary code inside template tags without the 'do' keyword

Thanks Caitlin for the workaround ;) However, as you can note, to write the following is not that much praticabile and readable: ${()=>{ //code here }()} At least, the *do *keyword will improve the situation with i.e: ${do { //code here }} PS: Is w/ or w/o the

Re: Re: Add support for arbitrary code inside template tags without the 'do' keyword

If it's any consolation, you can currently use Babel (f.e with Webpack, Browserify, etc) to compile do-expressions (babeljs.io/docs/plugins/syntax-do-expressions), so you can use the syntax right now. On Sun, Jan 10, 2016 at 11:07 PM, Manuel Di Iorio wrote: > Thanks Caitlin for