defrecord holding a incrementing `vector` / `java class`
Clojurians:
Thank you for your attention on this question !
Here is case I'm thinking about, I want to define a immutable bank account record
(defrecord account [ name balance statements])
(def cash-account (->account :cash 0.0 ))
I have a function that will deposit money to that account ,and a new record of account shall return
(.deposit cash-account 100.0 )
;; returns a new cash-account with attributes
;; name = :cash balance= 100, statment=[ [(2018,1,1),100 ] ]
With more and more deposit and withdraw happening , the field statement list will expanding with more and more transactions inside.
My question will be :
after 1000 transactions, there are 1000 elements in the statment field of latest account return.
When 1001th transaction happend:
will Clojure *copy* 1000 transactions in the statment field of old account record ,and append new transaction, save them into new account record ?
or Clojure just *append* the new transaction to the old account record and provide a new pointer to it , make it look like new account record like persistent map ?
Appreciate your help & many thanks
clojure
asked Nov 20 at 4:01
Shawn Zhang
9091616
add a comment |
Clojurians:
Thank you for your attention on this question !
Here is case I'm thinking about, I want to define a immutable bank account record
(defrecord account [ name balance statements])
(def cash-account (->account :cash 0.0 ))
I have a function that will deposit money to that account ,and a new record of account shall return
(.deposit cash-account 100.0 )
;; returns a new cash-account with attributes
;; name = :cash balance= 100, statment=[ [(2018,1,1),100 ] ]
With more and more deposit and withdraw happening , the field statement list will expanding with more and more transactions inside.
My question will be :
after 1000 transactions, there are 1000 elements in the statment field of latest account return.
When 1001th transaction happend:
will Clojure *copy* 1000 transactions in the statment field of old account record ,and append new transaction, save them into new account record ?
or Clojure just *append* the new transaction to the old account record and provide a new pointer to it , make it look like new account record like persistent map ?
Appreciate your help & many thanks
clojure
asked Nov 20 at 4:01
Shawn Zhang
9091616
add a comment |
Clojurians:
Thank you for your attention on this question !
Here is case I'm thinking about, I want to define a immutable bank account record
(defrecord account [ name balance statements])
(def cash-account (->account :cash 0.0 ))
I have a function that will deposit money to that account ,and a new record of account shall return
(.deposit cash-account 100.0 )
;; returns a new cash-account with attributes
;; name = :cash balance= 100, statment=[ [(2018,1,1),100 ] ]
With more and more deposit and withdraw happening , the field statement list will expanding with more and more transactions inside.
My question will be :
after 1000 transactions, there are 1000 elements in the statment field of latest account return.
When 1001th transaction happend:
will Clojure *copy* 1000 transactions in the statment field of old account record ,and append new transaction, save them into new account record ?
or Clojure just *append* the new transaction to the old account record and provide a new pointer to it , make it look like new account record like persistent map ?
Appreciate your help & many thanks
clojure
asked Nov 20 at 4:01
Shawn Zhang
9091616
Clojurians:
Thank you for your attention on this question !
Here is case I'm thinking about, I want to define a immutable bank account record
(defrecord account [ name balance statements])
(def cash-account (->account :cash 0.0 ))
I have a function that will deposit money to that account ,and a new record of account shall return
(.deposit cash-account 100.0 )
;; returns a new cash-account with attributes
;; name = :cash balance= 100, statment=[ [(2018,1,1),100 ] ]
With more and more deposit and withdraw happening , the field statement list will expanding with more and more transactions inside.
My question will be :
after 1000 transactions, there are 1000 elements in the statment field of latest account return.
When 1001th transaction happend:
will Clojure *copy* 1000 transactions in the statment field of old account record ,and append new transaction, save them into new account record ?
or Clojure just *append* the new transaction to the old account record and provide a new pointer to it , make it look like new account record like persistent map ?
Appreciate your help & many thanks
clojure
clojure
asked Nov 20 at 4:01
Shawn Zhang
9091616
asked Nov 20 at 4:01
Shawn Zhang
9091616
asked Nov 20 at 4:01
Shawn Zhang
9091616
asked Nov 20 at 4:01
Shawn Zhang
9091616
asked Nov 20 at 4:01
Shawn Zhang
9091616
9091616
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
From https://clojure.org/reference/datatypes#_deftype_and_defrecord :
- defrecord provides a complete implementation of a persistent map
- deftype supports mutable fields, defrecord does not
so, in your case, it will not copy the transactions, instead it will use a persistent data structure so it will look like the transaction was appended.
answered Nov 20 at 4:19
Denis Fuenzalida
884614
add a comment |
Here are some more docs you should also check:
- https://www.braveclojure.com/functional-programming/
- https://clojure.org/guides/learn/sequential_colls
- https://purelyfunctional.tv/guide/clojure-collections/
- https://youtu.be/lJr6ot8jGQE
answered Nov 20 at 8:02
Alan Thompson
13k22533
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
From https://clojure.org/reference/datatypes#_deftype_and_defrecord :
- defrecord provides a complete implementation of a persistent map
- deftype supports mutable fields, defrecord does not
so, in your case, it will not copy the transactions, instead it will use a persistent data structure so it will look like the transaction was appended.
answered Nov 20 at 4:19
Denis Fuenzalida
884614
add a comment |
From https://clojure.org/reference/datatypes#_deftype_and_defrecord :
- defrecord provides a complete implementation of a persistent map
- deftype supports mutable fields, defrecord does not
so, in your case, it will not copy the transactions, instead it will use a persistent data structure so it will look like the transaction was appended.
answered Nov 20 at 4:19
Denis Fuenzalida
884614
add a comment |
From https://clojure.org/reference/datatypes#_deftype_and_defrecord :
- defrecord provides a complete implementation of a persistent map
- deftype supports mutable fields, defrecord does not
so, in your case, it will not copy the transactions, instead it will use a persistent data structure so it will look like the transaction was appended.
answered Nov 20 at 4:19
Denis Fuenzalida
884614
From https://clojure.org/reference/datatypes#_deftype_and_defrecord :
- defrecord provides a complete implementation of a persistent map
- deftype supports mutable fields, defrecord does not
so, in your case, it will not copy the transactions, instead it will use a persistent data structure so it will look like the transaction was appended.
answered Nov 20 at 4:19
Denis Fuenzalida
884614
answered Nov 20 at 4:19
Denis Fuenzalida
884614
answered Nov 20 at 4:19
Denis Fuenzalida
884614
answered Nov 20 at 4:19
Denis Fuenzalida
884614
884614
add a comment |
add a comment |
Here are some more docs you should also check:
- https://www.braveclojure.com/functional-programming/
- https://clojure.org/guides/learn/sequential_colls
- https://purelyfunctional.tv/guide/clojure-collections/
- https://youtu.be/lJr6ot8jGQE
answered Nov 20 at 8:02
Alan Thompson
13k22533
add a comment |
Here are some more docs you should also check:
- https://www.braveclojure.com/functional-programming/
- https://clojure.org/guides/learn/sequential_colls
- https://purelyfunctional.tv/guide/clojure-collections/
- https://youtu.be/lJr6ot8jGQE
answered Nov 20 at 8:02
Alan Thompson
13k22533
add a comment |
Here are some more docs you should also check:
- https://www.braveclojure.com/functional-programming/
- https://clojure.org/guides/learn/sequential_colls
- https://purelyfunctional.tv/guide/clojure-collections/
- https://youtu.be/lJr6ot8jGQE
answered Nov 20 at 8:02
Alan Thompson
13k22533
Here are some more docs you should also check:
- https://www.braveclojure.com/functional-programming/
- https://clojure.org/guides/learn/sequential_colls
- https://purelyfunctional.tv/guide/clojure-collections/
- https://youtu.be/lJr6ot8jGQE
answered Nov 20 at 8:02
Alan Thompson
13k22533
answered Nov 20 at 8:02
Alan Thompson
13k22533
answered Nov 20 at 8:02
Alan Thompson
13k22533
answered Nov 20 at 8:02
Alan Thompson
13k22533
13k22533
add a comment |
add a comment |
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