FWIW, After working through the
example gists that I created last night, my opinion changed about the
look of Block Lambda's with pipes. As others on the list have said
previously and is now very clear to me, pipes provide a very distinct
visual cue "this is a block lambda, expect X to happen here" where the
{(args) expr } gets lost; these visual cues are important when you're
reading and writing "real world" programs in _javascript_.
I've updated a
version of my ES.next Smalltalk collections implementation experiment to
use block lambdas.
As
you might expect, this new version is even closer in form to the
original Smalltalk code.
In particularly, I was able to
eliminate all the artifacts that needed to be introduced because of
function expressions don't have Tennent's Correspondence.
In
the source, I've tagged the lines where TCP is using /*TCP*/
Allen
On Jan 12, 2012, at 2:23 PM, François REMY wrote:
If not (as it seems to me), it means that a block lambda will not be used as a statement by itself. If it's the case, it should defined as an _expression_ only, where there's no anonymous block to conflict the syntax. That solution has been chosen for object notation in the past. That way,
function() {
{
(a, b)
a.add(b)
}
}
would still be an anonymous block where
function() {
asyncAction(..., { (a, b) a.add(b); } }
}
would be a block lambda as an argument of an async function. No semantic change for an identical syntax, in regards to strict ES5.
So simple, and so brilliant. I love it!
I must say, the parens look much prettier to me, and they're of course more consistent with JS precedent.
It does help to write a reasonable chunk of code to compare syntaxes for uses of a feature "in the wild." Does some enterprising es-discusser wanna take a big JS program with a bunch of little anonymous functions, swap them out with block lambdas, and make two gists with the two different syntaxes? That'd be super helpful.
And since I still continue to hope we'll ditch the unprefixed anonymous block in some future revision of ES, that very small edge case could vanish at the same time.
I don't understand what you're referring to here -- what do you mean by "unprefixed anonymous block?"
Does it seems possible/acceptable?
Lovely.
Dave
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