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- Subject: Re: Lua 5.3 work1 Considering math.isinteger or type()
- From: Andrew Starks <andrew.starks@...>
- Date: Wed, 24 Jul 2013 16:01:59 -0500
On Wed, Jul 24, 2013 at 3:34 PM, Thijs Schreijer
> the missing love (from my part) is because the proposed isxxxxx() functions can be easily created on top of the most minimal required function to detect the difference of types.
> Having read most of it I think my preference would be a ˋsubtype()ˋ function, that would honor an ˋ__subtypeˋ metamethod (and, optionally, in absence of ˋ__subtypeˋ would return the name of a metatable).
> everything else can be easily built as an extension on top of this.
I see. Yes, it is trivial to make an adhoc isxxx function. What it
does provide is a clean what to accomplish what subtype accomplishes,
without leading to the inevitable, "what about subsubtype?"
type.isnumber(2.1) --> true
type.isfloat(2.1) --> true
Then later, in some Haskel-esque version of Lua:
A function gives you more power than what equality to a string can.
Also, this keeps type related stuff inside of `type` and it doesn't
type(2.1) --> "number"
That said, I like:
type(2.1, "float", "number") --> true
I'm going to steal that idea for my personal monkeypatched `type`,
which has to be *the* most abused standard library function in Lua.