steel/identity
bool?
Alias for boolean?. Returns true if the value is a boolean.
(bool? value) -> boolean?
value: any — the value to test
Examples
> (bool? #false)
#true
> (bool? "hi")
#false
boolean?
Returns true if the value is a boolean (#true or #false).
(boolean? value) -> boolean?
value: any — the value to test
Examples
> (boolean? #true)
#true
> (boolean? #false)
#true
> (boolean? 0)
#false
complex?
Checks if the given value is a complex number
(complex? value) -> boolean?
- value : any - The value to check
Examples
> (complex? 3+4i) ;; => #t
> (complex? 42) ;; => #t
> (complex? "hello") ;; => #f
eof-object?
Returns #t if the value is an EOF object.
(eof-object? any/c) -> bool?
exact-integer?
Checks if the given value is an exact integer
(exact-integer? value) -> boolean?
- value : any - The value to check
Examples
> (exact-integer? 42) ;; => #t
> (exact-integer? -42) ;; => #t
> (exact-integer? 4.0) ;; => #f
float?
Checks if the given value is a floating-point number
(float? value) -> boolean?
- value : any - The value to check
Examples
> (float? 42) ;; => #f
> (float? 3.14) ;; => #t
> (float? #t) ;; => #f
function?
Returns true if the value is a function or callable.
(function? value) -> boolean?
value: any — the value to test
Examples
> (function? (lambda (x) x))
#true
> (function? map)
#true
> (function? 42)
#false
hash?
Returns true if the value is a hash map.
(hash? value) -> boolean?
value: any — the value to test
Examples
> (hash? (hash 'a 10 'b 20))
#true
> (hash? '(a b c))
#false
int?
Checks if the given value is an integer, an alias for integer?
(int? value) -> boolean?
- value : any - The value to check
Examples
> (int? 42) ;; => #t
> (int? 3.14) ;; => #f
> (int? "hello") ;; => #f
integer?
Checks if the given value is an integer, an alias for int?
(integer? value) -> boolean?
- value : any - The value to check
Examples
> (integer? 42) ;; => #t
> (integer? 3.14) ;; => #f
> (integer? "hello") ;; => #f
list?
Returns true if the value is a list.
(list? value) -> boolean?
value: any — the value to test
Examples
> (list? '(1 2 3))
#true
> (list? "not-a-list")
#false
not
Returns true if the given value is exactly #false.
(not value) -> boolean?
value: any — the value to test
Examples
> (not #false)
#true
> (not #true)
#false
> (not "hello")
#false
number?
Checks if the given value is a number
(number? value) -> boolean?
- value : any - The value to check
Examples
> (number? 42) ;; => #t
> (number? "hello") ;; => #f
> (number? 'symbol) ;; => #f
rational?
Returns #t if obj is a rational number, #f otherwise. Rational numbers are numbers that can be expressed as the quotient of two numbers. For example, 3/4, -5/2, 0.25, and 0 are rational numbers.
(rational? value) -> bool?
- value : any - The value to check
Examples:
> (rational? (/ 0.0)) ;; => #f
> (rational? 3.5) ;; => #t
> (rational? 6/10) ;; => #t
> (rational? +nan.0) ;; => #f
real?
Checks if the given value is a real number
(real? value) -> boolean?
- value : any - The value to check
Examples
> (real? 42) ;; => #t
> (real? 3+4i) ;; => #f
> (real? "hello") ;; => #f
set?
Returns true if the value is a hash set.
(set? value) -> boolean?
value: any — the value to test
Examples
> (set? (hashset 10 20 30 40))
#true
> (set? "abc")
#false
string?
Returns true if the value is a string.
(string? value) -> boolean?
value: any — the value to test
Examples
> (string? "hello")
#true
> (string? 'foo)
#false
symbol?
Returns true if the value is a symbol.
(symbol? value) -> boolean?
value: any — the value to test
Examples
> (symbol? 'hello)
#true
> (symbol? "hello")
#false
vector?
Returns true if the value is a vector (mutable or immutable).
(vector? value) -> boolean?
value: any — the value to test
Examples
> (vector? #(1 2 3))
#true
> (vector? 'foo)
#false
void?
Returns true if the value is void.
(void? value) -> boolean?
value: any — the value to test
Examples
> (void? void)
#true
> (void? 42)
#false