At JSConf there was a talk about using macros to experiment with new language
features.
The library mentioned is sweet.js (http://sweetjs.org/).
Maybe you could implement it as a macro for developers to play around?
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I've been playing around with using destructuring as function arguments
and have come across some odd behaviors that I'm not sure are
intentional (or perhaps, not to spec). For context, consider the
following function:
```
function setCookie(name, value, { secure, path, domain, expires }) {
Seems like any identifiers in the arguments should always be defined in
scope before ever considering what they will be assigned.
On May 31, 2014 11:59 AM, Nicholas C. Zakas standa...@nczconsulting.com
wrote:
I've been playing around with using destructuring as function arguments
and have come
On Sat, May 31, 2014 at 11:59 AM, Nicholas C. Zakas
standa...@nczconsulting.com wrote:
I've been playing around with using destructuring as function arguments
and have come across some odd behaviors that I'm not sure are intentional
(or perhaps, not to spec). For context, consider the
Nicholas C. Zakas wrote:
```
function setCookie(name, value, { secure, path, domain, expires } = {}) {
console.log(secure);
// ...
}
```
Unfortunately, that resulted in a syntax error in Firefox.
Could you please file a bug against SpiderMonkey? Thanks,
/be
Matthew Robb wrote:
Seems like any identifiers in the arguments should always be defined
in scope before ever considering what they will be assigned.
Right, and they are in scope no matter what.
Seems to me that an implementation bug (can't have parameter default
value for destructuring
On May 31, 2014, at 8:59 PM, Nicholas C. Zakas standa...@nczconsulting.com
wrote:
I've been playing around with using destructuring as function arguments and
have come across some odd behaviors that I'm not sure are intentional (or
perhaps, not to spec).
Argument binding initialization
On Sat, May 31, 2014 at 1:59 PM, Nicholas C. Zakas
standa...@nczconsulting.com wrote:
1. Who is right about assigning a default value to a destructured parameter,
Firefox or Traceur?
Traceur is right.
2. Is the behavior of not having any bindings for destructured parameter
properties
In addition to what Allen said, you could also do something like this:
function setCookie(name, value, { secure, path, domain, expires } =
cookieDefaults) { }
where `cookieDefaults` is defined elsewhere.
Or you could do something like:
function setCookie(name, value, { secure = false,
Or, for more readable code:
function setCookie(name, value, options = {}) {
let {
secure = false,
path = ,
domain = ,
expires = whenever()
} = options;
// Do stuff
}
Kevin
On Sat, May 31, 2014 at 1:41 PM, Brendan Eich bren...@mozilla.org wrote:
Matthew Robb wrote:
Seems like any identifiers in the arguments should always be defined in
scope before ever considering what they will be assigned.
Right, and they are in scope no matter what.
Seems to me that an
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