github at esdiscuss.org (2013-07-12T02:27:36.872Z)
On 01/06/2013, at 23:49, Axel Rauschmayer wrote:
> You'll rarely, if ever, need IIFEs with ES6, thanks to block-scoped function declarations and for-of (which creates a fresh copy of the iteration variable for each iteration).
>
> Thus, instead of:
>
> ```js
> (function () {
> var tmp = ?;
> }());
> ```
>
> you can do:
>
> ```js
> {
> let tmp = ?;
> }
> ```
>
> I'd still love to have do-blocks, though.
But they're not fully interchangeable, for example I can exit a function at any point with a return, but can I exit a block at any point with a break or something? Also a function returns a value, does a block evaluate to something?
In any case, I would really like to know which parenthesis or curly braces can I leave out in an immediately invocated arrow function expression, for example this:
```js
var x= (=>{
//...
})();
```
Is it correct ES6? Is there anything else that I could rmv in that IIAFE?
On 01/06/2013, at 23:49, Axel Rauschmayer wrote: > > On Jun 1, 2013, at 14:38 , Jorge <jorge at jorgechamorro.com> wrote: >> >> How would this: >> >> (Function () { >> >> // ... >> >> })(); >> >> now look like with arrow functions? >> >> (()=>{ >> >> // ... >> >> })(); >> >> What can be left out, if anything? >> > > You’ll rarely, if ever, need IIFEs with ES6, thanks to block-scoped function declarations and for-of (which creates a fresh copy of the iteration variable for each iteration). > > Thus, instead of: > > (function () { > var tmp = …; > }()); > > you can do: > > { > let tmp = …; > } > > I’d still love to have do-blocks, though. But they're not fully interchangeable, for example I can exit a function at any point with a return, but can I exit a block at any point with a break or something? Also a function returns a value, does a block evaluate to something? In any case, I would really like to know which parenthesis or curly braces can I leave out in an immediately invocated arrow function expression, for example this: var x= (=>{ //... })(); Is it correct ES6? Is there anything else that I could rmv in that IIAFE? Thank you! -- ( Jorge )();