On Thu, Sep 19, 2013 at 9:30 AM, Rick Waldron <[email protected]> wrote: > On Thu, Sep 19, 2013 at 4:16 AM, Dmitry Soshnikov > <[email protected]> wrote: >> >> Hi, >> >> Out of curiosity: we have static methods, but seems there is no yet >> ability to define a class/static property/constant. >> >> class A { >> const VALUE = 10; >> } >> >> or (probably better to be consistent with static methods): >> >> class A { >> static VALUE = 10; >> } >> > > There are a few reasons, the first being that there was no "static" prefix > when maximally minimal classes were accepted, but of course the class > feature grew a little (which is a good thing). "static", with regard to > methods, is straight forward, whereas data properties create a potential > ambiguity: > > class A { > const VALUE = 10; > } > > A decision would have to be made for "const VALUE = 10" here: does it mean > mean `A.VALUE` and not `var a = new A(); a.VALUE;`? If it means the latter, > then there are implications that will change a possible future that includes > "private x = 1" in the same class-body position. > > I spoke with Allen off-line and he reminded me that a static "const-like" > could be created like this: > > class A { > static get VALUE() { return "some constant value"; } > } > > A.VALUE; > > (I quoted const-like, because this is still configurable) > > > >> >> Was it a special reason or was it just forgotten? (One could define a var >> in the static scope, but seems it's useful to have the feature inline in the >> class bodies). >> >> P.S.: in addition -- why not to reuse `static` for also simple functions? >> >> function getHeavyValue() { >> static heavyValue; >> if (!heavyValue) { >> // heavy calc >> } >> return heavyValue; >> } >> > > This is a no-go because "static" is only reserved in strict mode, which > means > > function foo() { > static = 1; > } > > (awful, yes—but legal)
Not true. static is a keyword since ES2. 7.4.3, Future keywords http://www.ecma-international.org/publications/files/ECMA-ST-ARCH/ECMA-262,%202nd%20edition,%20August%201998.pdf -- erik _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
