2 Number utilities

(require (planet untyped/unlib/number))

Useful number utilities.

(number+false? item) → boolean?

item : any

Returns #t if item is a number or #scheme[#f].

(integer+false? item) → boolean?

item : any

Returns #t if item is an integer or #scheme[#f].

(natural? item) → boolean?

item : any

Returns #t if item is an natural number (>= 0).

(natural+false? item) → boolean?

item : any

Returns #t if item is an natural number (>= 0) or #f.