number

number

A number may be an int or a real int values answer all the messages of real values plus a few of their own.

predicates

(num? x) -> returns true if x is a number

(int? x) -> returns true if x is an integer

(num? 1)    ; true
(num? 1/2)  ; true
(num? 2.3)  ; true
(num? "23") ; false
    
(int? 1)    ; true
(int? 2/1)  ; true
(int? 2.0)  ; true
(int? 1/2)  ; false
(int? 2.3)  ; false

messages

(def x 1)
(def y 2.3)
(def z 0)
(def w -1)

x.type   ; (int number)
y.type   ; (real number)
z.type   ; (int number)

x.zero?  ; false
y.zero?  ; false
z.zero?  ; true

x.pos?   ; true
x.neg?   ; false
w.pos?   ; false
w.neg?   ; true
z.pos?   ; false
z.neg?   ; false

; <number>.abs returns the absolute value

x.abs    ; 1
w.abs    ; 1

; <number>.to-bool returns false if x is 0, true otherwise.

x.to-bool   ; true
w.to-bool   ; true
z.to-bool   ; false

(def pi math.pi)
(def e math.e)
(def anti-e (* e -1))

x.to-text   ; "1"
pi.to-text  ; "3.14159265358979"
e.to-text   ; "2.71828182845905"

pi.floor    ; 3
pi.ceil     ; 4
pi.round    ; 3

e.floor     ; 2
e.ceil      ; 3
e.round     ; 3
e.truncate  ; 2

anti-e.floor     ; -3
anti-e.ceil      ; -2
anti-e.round     ; -3
anti-e.truncate  ; -2

; int-only messages

x.inc    ; 2
x.dec    ; 0
x.even?  ; false
x.odd?   ; true