I mailed Arv and he kindly offered to draft and champion a bite-sized
strawman for ES7, to support if/while/switch(let). Yay!
/be
Waldemar Horwat <mailto:[email protected]>
December 3, 2013 2:55 AM
I frequently use the C++ equivalent of this. Haven't proposed it as
part of the scoping upgrades just to keep things small, but I don't
have any good reason not to do something like this either. It kind of
falls in the same bucket as &&=, ||=, and ^^.
Waldemar
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Nick Krempel <mailto:[email protected]>
November 29, 2013 5:29 PM
Couldn't find anything on this in the archives, but is there a
proposal for:
if (let var = expr) {
// var in scope
}
else {
// var in scope
}
// var out of scope
i.e. shorthand for:
{
let var = expr;
if (var) {
// ...
}
else {
// ...
}
}
Also:
switch (let var = expr) {
case foo:
// var in scope
default:
// var in scope
}
// var out of scope
...which has a similar expansion.
Similarly for "while" and "do...while": this would bring everything in
line with the current "for" / "for in" / "for of".
This also matches what C++ allows, with the exception of "do...while"
(in our case, it seems acceptable to allow "do...while" too - the
value would simply be "undefined" on the first iteration).
("const" should also be OK in place of "let", at least for "if" and
"switch".)
Nick
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