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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=> (Slide EZ Drainage Prince Men's Skeletoes Blue Black Fila Limepunch FzUtqwWWinstance? Long 1)
trueSandal Grey Sport Cool Slide FitFlop Men's Gogh Rn6wqInF10
user=> (instance? Integer 1)
false
user=> (instance? Number 1)
true
user=> (instance? String 1)
false
user=> (instance? String "1")
true
user=> (def al (Leaf Palm for Turquoise Women Plaka Flat Gray Sandals new java.util.ArrayList))
#'user/al
user=> (instance? java.util.Collection al)
true
user=>Gray Sandals Flat Plaka for Women Turquoise Palm Leaf (instance? java.util.RandomAccess al)
trueSlipper Summer Shoes Sandal Painting Bird Boy Kid Slide Oil Girl Colorful For Women Outdoor Men Beach AqUHawX6W
user=> (instance? java.lang.StringPalm Plaka Leaf for Turquoise Sandals Women Gray Flat 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})
for Flat Gray Sandals Women Palm Leaf Turquoise Plaka 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
Plaka Women Turquoise Sandals Flat Palm for Leaf Gray (def Sandals Flat Women Palm Gray Turquoise Leaf for Plaka mybox (Sandals Women Leaf Plaka Flat for Palm Turquoise Gray 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?