Andreas Rossberg wrote:
On 19 March 2012 21:13, Allen Wirfs-Brock <[email protected]
<mailto:[email protected]>> wrote:
(Yet Another Wacky Syntax Idea)
Here is a relatively common coding pattern:
var a;
var obj = {
get a() {return a},
set a(v) {a=v}
};
Often the intent is that the variable a should only be used within
the object literal. The block scoping with let and do operator will
allow the variable and object literal to be group in this manner:
let obj = do {
let a;
({get a() {return a},
set a()v) {a=v}
})
}
Unfortunately, the object literal has to be enclosed in parentheses
because an expression statement cannot begin with an object literal.
The same would be the case if a function expression was involved
rather than an object literal.
How about reusing 'new'?
let obj = do {
let a;
new {
get a() {return a},
set a()v) {a=v}
}
}
Or let. We may allow let have object literals in list of assignments and
return the last item. So "local var for obj literal" scenario could be:
let obj = do {
let a, {
get a() {return a},
set a(v) {a=v}
}
}
And you could write it is one-liner expressions like:
let accumulator = let a = 0, { add (x) { return a+=x; } };
/Andreas
Herby
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