>>Some words got reserved in ES5 that weren't in ES3. Ahh, I understand now.
On Mon, Aug 29, 2011 at 10:06 AM, Xavier MONTILLET <[email protected]>wrote: > Some words got reserved in ES5 that weren't in ES3. > e.g., arguments got reserved (at least in strict mode) > So you CAN do this: > > { > arguments: true > } > > ES 3 won't care because it doesn't see arguments as reserved and ED 5 > won't either because it allows using reserved words that way. > > On Mon, Aug 29, 2011 at 6:57 PM, Nathan Sweet <[email protected]> > wrote: > >>>Then we can still use words that got reserved in ES5. > >>>In ES3, they aren't reserved so everything goes well and in ES5, they > >>>are allowed to be used that way. > > Wait...what? If I'm understanding your summation correctly you have it > > wrong. They are reserved in ES3, and most/all ES3 browsers will throw > errors > > if you try to use a reserved word as a propertyName in identifier form > (ie > > dot-notation). > > var o = {delete:true} > > //This will throw an unrecoverable error in ES3 browsers > > To be clear. Until all the ES3 browsers are deprecated, you should not > use > > reserved words as identifiers (function declarations, variable > declarations, > > propertyName using dot-notation). When ES5 is the standard you will be > able > > to use a reserved word as propertyName with dot and bracket notation, > right > > now you can only use bracket-notation. You will *not* be able to use > > reserved words in ES5 for variable declarations and function > declarations. > > See my post above. > > On Mon, Aug 29, 2011 at 9:35 AM, Xavier MONTILLET < > [email protected]> > > wrote: > >> > >> Then we can still use words that got reserved in ES5. > >> In ES3, they aren't reserved so everything goes well and in ES5, they > >> are allowed to be used that way. > >> > >> On Mon, Aug 29, 2011 at 6:01 PM, Lasse Reichstein > >> <[email protected]> wrote: > >> > > >> > > >> > On Sun, Aug 28, 2011 at 1:38 PM, Skateside <[email protected]> > wrote: > >> >> > >> >> You can't use reserved words as variables or function names. You can > >> >> use them as object properties, but only if they're passed in as a > >> >> string (by wrapping them in quotation marks) > >> > > >> > Actually, in ES5, you can use them unquoted as keys in object literals > >> > and > >> > in property access/ > >> > > >> >> > >> >> var o = {delete: true}; // causes an error because delete is a > >> >> reserved word. > >> >> o.delete; // same error as before. > >> > > >> > I.e., neither of these throw an error in ES5 (which is in all current > >> > version browsers). > >> > > >> >> > >> >> var o = {"delete": true}; // fine. > >> >> o['delete']; // true > >> > > >> > That's still allowed too. > >> > /L > >> > > >> > -- > >> > To view archived discussions from the original JSMentors Mailman list: > >> > http://www.mail-archive.com/[email protected]/ > >> > > >> > To search via a non-Google archive, visit here: > >> > http://www.mail-archive.com/[email protected]/ > >> > > >> > To unsubscribe from this group, send email to > >> > [email protected] > >> > > >> > >> -- > >> To view archived discussions from the original JSMentors Mailman list: > >> http://www.mail-archive.com/[email protected]/ > >> > >> To search via a non-Google archive, visit here: > >> http://www.mail-archive.com/[email protected]/ > >> > >> To unsubscribe from this group, send email to > >> [email protected] > > > > -- > > To view archived discussions from the original JSMentors Mailman list: > > http://www.mail-archive.com/[email protected]/ > > > > To search via a non-Google archive, visit here: > > http://www.mail-archive.com/[email protected]/ > > > > To unsubscribe from this group, send email to > > [email protected] > > > > -- > To view archived discussions from the original JSMentors Mailman list: > http://www.mail-archive.com/[email protected]/ > > To search via a non-Google archive, visit here: > http://www.mail-archive.com/[email protected]/ > > To unsubscribe from this group, send email to > [email protected] > -- To view archived discussions from the original JSMentors Mailman list: http://www.mail-archive.com/[email protected]/ To search via a non-Google archive, visit here: http://www.mail-archive.com/[email protected]/ To unsubscribe from this group, send email to [email protected]
