Hi Pawel, datatype is a verb defined in the z locale that might do what you require
datatype 's' literal datatype 0 boolean datatype 3 : 0 n=. 1 2 4 8 16 32 64 128 1024 2048 4096 8192 16384 32768 65536 131072 262144 t=. '/boolean/literal/integer/floating/complex/boxed/extended/rational' t=. t,'/sparse boolean/sparse literal/sparse integer/sparse floating' t=. t,'/sparse complex/sparse boxed/symbol/unicode/unicode4' (n i. 3!:0 y) pick <;._1 t ) or you could use the 3!:0 foreign conjunction that is at the core of the functionality and returns the powers of 2 identifiers. Cheers, bob > On Sep 10, 2022, at 11:49, Pawel Jakubas <jakubas.pa...@gmail.com> wrote: > > Dear J users, > > What is the way to detect number that could be represented as integer, > float, could be negative, could assume scientific notation or rational. Is > there something like isNumber or isString ? > I would like to have something like this: > > if. (detect_number i) do. > process number > else. > process string > > and detect_number to survive inputs > i=: 2 > i=: _2 > i=: 2r3 > i=: 2.3333 > i=: 4.29497e9 > i=: 'Two' > > Thanks and cheers, > Pawel > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
