> If you use `a.-1` to represent `a[length-1]`, so how do we refer to the value of the `-1` property?
`a[-1]`, as at present. > It is obvious that ‘.’ before a number will be recognized as a decimal point, I don't think it's that obvious. I'm not a parsing guy, but I don't think the parser works backward, looking for dots preceding numbers. I would assume simplistically that a dot following an expression currently puts the parser into a mode where it is looking for the following identifier, so that logic could conceivably be tweaked to look alternatively for an integer index. `a.0` seems eminently parseable to me. On Tue, Sep 27, 2016 at 6:40 PM, Li Xiaolong <[email protected]> wrote: > It is obvious that ‘.’ before a number will be recognized as a decimal > point, which is different from the point that gets a property. For example, > .2===0.2 is true. What’s more, the array’s prototype is object, which means > arr[-1] will get the value of -1 rather than length-1. The array can store > values at -1 like other objects. If you use -1 to represent length-1, so > how do we refer to the value of -1? > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss > >
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