R5RS secondary predicates

Secondary predicates are only applicable to specific expressions (for example, to numbers). They will throw a type error when applied to expressions they are not intended for. The predicates here are part of the Scheme standard R5RS.

Type predicateDescription
char-alphabetic?alphabetic character
char-lower-case?lower-case character
char-numeric?numeric character
char-upper-case?upper-case character
char-whitespace?whitespace character
even?even number
exact?exact number
inexact?inexact number
negative?negative number
odd?odd number
positive?positive number
zero?zero

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