Re: ["all"] as an Lvalue?

[Steve Litt <slitt@...>]

On Mon, 28 Mar 2016 23:10:18 -0300
Hisham <h@hisham.hm> wrote:

> On 28 March 2016 at 22:04, Daurnimator <quae@daurnimator.com> wrote:
> > On 29 March 2016 at 11:55, Steve Litt <slitt@troubleshooters.com>
> > wrote:  
> >> Hi all,
> >>
> >> I'm writing a document on Luakit, and in my section on making fonts
> >> bigger, I need to give instructions to edit the domain_props table,
> >> which looks something like this:
> >>
> >> =====================================================
> >> domain_props = {
> >>     ["all"] = {
> >>         enable_scripts          = false,
> >>         enable_plugins          = false,
> >>         enable_private_browsing = false,
> >>         user_stylesheet_uri     = "",
> >>     },
> >>     ["youtube.com"] = {
> >>         enable_scripts = true,
> >>         enable_plugins = true,
> >>     },
> >> }
> >> =====================================================
> >>
> >> It looks like domain_props is a table whose two elements are each
> >> tables, named ["all"] and ["youtube.com"] respectively. I've never
> >> seen something like ["all"] being the name of a table element or a
> >> variable name before. What's going on, is ["all"] an anonymous
> >> table containing element "all"? I just don't understand this
> >> syntax, and why somebody would do this. What am I missing?  
> >
> > { foo = "bar" }
> > is actually just short for:
> > { ["foo"] = "bar" }
> >
> > The first shorter form however only works for keys that are valid
> > identifiers. Which means you have to use the 2nd form for:
> >   - keywords (e.g. {["end"] = 1234})
> >   - non-valid identifiers
> >       - e.g. starting with a number: {["1thing"] = item}
> >       - e.g. containing a ".": {["youtube.com"] = "a website"}
> >   - non-string keys. e.g. {[50] = "number as key"}  
> 
> All three answers are correct, but if this was Stack Overflow yours
> would be the one I would upvote, for being the clearest. :)
> 
> -- Hisham

Thanks Hisham!

Thanks to all the list's explanations, I got Luakit to work perfectly.

SteveT

Steve Litt 
March 2016 featured book: Quit Joblessness: Start Your Own Business
http://www.troubleshooters.com/startbiz