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Why does (condp contains? (:symbols xx) :a (prn “yes”)) give contains? not supported on type: clojure.lang.Keyword error?

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1

I want to use condp for a problem.

This is what I am trying to checking using condp.

(def xx :symbols :a 1)

(contains? (:symbols xx) :a)

true

But I get this error

(condp contains? (:symbols xx) :a (prn "yes"))

IllegalArgumentException contains? not supported on type: 
clojure.lang.Keyword clojure.lang.RT.contains

clojure

share|improve this question

edited Mar 28 at 18:25

Snehaa Ganesan

asked Mar 28 at 17:58

Snehaa GanesanSnehaa Ganesan

34099 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Please update your question with the value of xx
  
  – Alan Thompson
  Mar 28 at 18:09
  
  

  
  
  
  

add a comment
 | 

1

I want to use condp for a problem.

This is what I am trying to checking using condp.

(def xx :symbols :a 1)

(contains? (:symbols xx) :a)

true

But I get this error

(condp contains? (:symbols xx) :a (prn "yes"))

IllegalArgumentException contains? not supported on type: 
clojure.lang.Keyword clojure.lang.RT.contains

clojure

share|improve this question

edited Mar 28 at 18:25

Snehaa Ganesan

asked Mar 28 at 17:58

Snehaa GanesanSnehaa Ganesan

34099 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Please update your question with the value of xx
  
  – Alan Thompson
  Mar 28 at 18:09
  
  

  
  
  
  

add a comment
 | 

I want to use condp for a problem.

This is what I am trying to checking using condp.

(def xx :symbols :a 1)

(contains? (:symbols xx) :a)

true

But I get this error

(condp contains? (:symbols xx) :a (prn "yes"))

IllegalArgumentException contains? not supported on type: 
clojure.lang.Keyword clojure.lang.RT.contains

clojure

share|improve this question

edited Mar 28 at 18:25

Snehaa Ganesan

asked Mar 28 at 17:58

Snehaa GanesanSnehaa Ganesan

34099 bronze badges

(def xx :symbols :a 1)

(contains? (:symbols xx) :a)

true

(condp contains? (:symbols xx) :a (prn "yes"))

IllegalArgumentException contains? not supported on type: 
clojure.lang.Keyword clojure.lang.RT.contains

share|improve this question

edited Mar 28 at 18:25

Snehaa Ganesan

asked Mar 28 at 17:58

Snehaa GanesanSnehaa Ganesan

34099 bronze badges

share|improve this question

edited Mar 28 at 18:25

Snehaa Ganesan

asked Mar 28 at 17:58

Snehaa GanesanSnehaa Ganesan

34099 bronze badges

asked Mar 28 at 17:58

Snehaa GanesanSnehaa Ganesan

34099 bronze badges

asked Mar 28 at 17:58

Snehaa GanesanSnehaa Ganesan

34099 bronze badges

1 Answer
1

active

oldest

votes

2

This is due to the order of arguments being passed to contains? by condp — it's passing the keyword as the first argument. If you create an anonymous function that swaps the argument order, it'll do what you want:

user=> (def xx :symbols #:a :b)
user=> (condp #(contains? %2 %1) (:symbols xx) :a (prn "yes"))
"yes"
nil

This is the relevant line from the condp doc string explaining that argument-order behavior:

For each clause, (pred test-expr expr) is evaluated.

share|improve this answer

answered Mar 28 at 18:16

Taylor WoodTaylor Wood

13.1k11 gold badge99 silver badges2727 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for answering @TaylorWood !!
  
  – Snehaa Ganesan
  Mar 28 at 18:30
  

  
  
  
  

add a comment
 | 

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2

This is due to the order of arguments being passed to contains? by condp — it's passing the keyword as the first argument. If you create an anonymous function that swaps the argument order, it'll do what you want:

user=> (def xx :symbols #:a :b)
user=> (condp #(contains? %2 %1) (:symbols xx) :a (prn "yes"))
"yes"
nil

This is the relevant line from the condp doc string explaining that argument-order behavior:

For each clause, (pred test-expr expr) is evaluated.

share|improve this answer

answered Mar 28 at 18:16

Taylor WoodTaylor Wood

13.1k11 gold badge99 silver badges2727 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for answering @TaylorWood !!
  
  – Snehaa Ganesan
  Mar 28 at 18:30
  

  
  
  
  

add a comment
 | 

2

This is due to the order of arguments being passed to contains? by condp — it's passing the keyword as the first argument. If you create an anonymous function that swaps the argument order, it'll do what you want:

user=> (def xx :symbols #:a :b)
user=> (condp #(contains? %2 %1) (:symbols xx) :a (prn "yes"))
"yes"
nil

This is the relevant line from the condp doc string explaining that argument-order behavior:

For each clause, (pred test-expr expr) is evaluated.

share|improve this answer

answered Mar 28 at 18:16

Taylor WoodTaylor Wood

13.1k11 gold badge99 silver badges2727 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for answering @TaylorWood !!
  
  – Snehaa Ganesan
  Mar 28 at 18:30
  

  
  
  
  

add a comment
 | 

This is due to the order of arguments being passed to contains? by condp — it's passing the keyword as the first argument. If you create an anonymous function that swaps the argument order, it'll do what you want:

user=> (def xx :symbols #:a :b)
user=> (condp #(contains? %2 %1) (:symbols xx) :a (prn "yes"))
"yes"
nil

This is the relevant line from the condp doc string explaining that argument-order behavior:

For each clause, (pred test-expr expr) is evaluated.

share|improve this answer

answered Mar 28 at 18:16

Taylor WoodTaylor Wood

13.1k11 gold badge99 silver badges2727 bronze badges

user=> (def xx :symbols #:a :b)
user=> (condp #(contains? %2 %1) (:symbols xx) :a (prn "yes"))
"yes"
nil

share|improve this answer

answered Mar 28 at 18:16

Taylor WoodTaylor Wood

13.1k11 gold badge99 silver badges2727 bronze badges

answered Mar 28 at 18:16

Taylor WoodTaylor Wood

13.1k11 gold badge99 silver badges2727 bronze badges

answered Mar 28 at 18:16

Taylor WoodTaylor Wood

13.1k11 gold badge99 silver badges2727 bronze badges