Is this a valid number?

validnump expression
validnum? expression

Returns true if the result of expression is a number but not "Not-a-Number" value neither an infinity, otherwise returns false.


(print 5 validnum? 5)
(print 5/0 validnum? 5/0)
(print log -1 validnum? log -1)


5 True
Infinity False
NaN False

See also:

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