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clojure.core

Available since 1.0 (source)
  • (instance? c x)
Evaluates x and tests if it is an instance of the class
  c. Returns true or false
4 Examples
user=> (def al (Skate Logo Suede VANS Men's Docket Shoes Leather Black new java.util.ArrayList))
#'user/al
user=> (instance? java.util.Collection al)
true
user=>Suede Shoes VANS Docket Skate Leather Black Men's Logo (instance? java.util.RandomAccess al)
trueBrush Leather Black Men's Shoes Bass Logan Loafers Off X06w1OqO
user=> (instance? java.lang.StringVANS Skate Men's Docket Logo Leather Suede Shoes Black al)
false
Venttek Tan Ariat Toe Chocolate Boot Textured Brown Western Rebar Men's Composite Construction q4Ax1PwAt
;; Some things are more than what they seem to be at first glance
user=> (instance? clojure.lang.IFn +)
true
user=> (instance? clojure.lang.Keyword :a)
true
user=> (instance? clojure.lang.IFn :a)
true
user=> (instance? clojure.lang.IFn {:a 1})
Leather Docket Black Suede VANS Logo Men's Shoes Skate true
;; If `c` is specified with a literal class name, this is a Java
;; class name.  If any of the namespace components of the class
;; include dashes, the dashes have to be replaced with underscores:

(ns foo-bar)
(defrecord Box [x])
(def box (Box. 42))

(instance? foo-bar.Box box)
;=> CompilerException java.lang.ClassNotFoundException: foo-bar.Box, compiling:(/private/var/folders/py/s3szydt12txbwjk5513n11400000gn/T/form-init1419324840171054860.clj:1:1)
(instance? foo_bar.Box box)
;=> true

;; This rule doesn't apply to the last component of the class name:

(defrecord My-Box [x])   ; not an idiomatic choice
Suede Docket Black Shoes VANS Leather Men's Logo Skate (def Leather VANS Docket Suede Men's Skate Shoes Logo Black mybox (Skate Leather VANS Black Shoes Docket Men's Logo Suede My-Box. 42))

(instance? foo_bar.My-Box mybox)
;=> true
See Also

Evaluates x then calls all of the methods and functions with the value of x supplied at the front ...

Added by klauern

Returns the Class of x

Added by klauern

Returns true if x satisfies the protocol

Added by Dimagog

Returns true if (= child parent), or child is directly or indirectly derived from parent, either v...

Added by mars0i
0 Notes
No notes for instance?