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Right way to change a value on a map on clojure
2019 Community Moderator ElectionScala vs. Groovy vs. ClojureMapping a function on the values of a map in ClojureClojure - Map through all levelsTransforming a map with a map of functions in clojureIn clojure, why does assoc require arguments in addition to a map, but dissoc not?Clojure: treat multiple arguments to < and +Clojure deep-merge to ignore nil valuesClojure: iterate over map of setsIncrementing Values in Clojure MapException using map and anonymous functions in Clojure
Alright, I'm new to clojure, this should be easy but for the life of me I can't find the answer
Let's say I have this map
(def mymap :a 10 :b 15)
Now I want to change the value of :a to 5. I don't know how to do this properly
I know update and assoc can make changes but they both receive a function as last argument, which applies to the value. I don't want that, I don't want any function to run, I just want to simply set :a to 5.
I think I can pass an anonymous function that simply returns 5 and ignores the arg, but is this the right way? Doesn't look good to me
(update mymap :a (fn [arg] 5))
clojure
asked Mar 6 at 22:04
GBarrosoGBarroso
147112
add a comment |
Alright, I'm new to clojure, this should be easy but for the life of me I can't find the answer
Let's say I have this map
(def mymap :a 10 :b 15)
Now I want to change the value of :a to 5. I don't know how to do this properly
I know update and assoc can make changes but they both receive a function as last argument, which applies to the value. I don't want that, I don't want any function to run, I just want to simply set :a to 5.
I think I can pass an anonymous function that simply returns 5 and ignores the arg, but is this the right way? Doesn't look good to me
(update mymap :a (fn [arg] 5))
clojure
asked Mar 6 at 22:04
GBarrosoGBarroso
147112
1
associs what you're looking for; no last-arg function. clojuredocs.org/clojure.core/assoc
– Micah Elliott
Mar 6 at 22:19
1
assocdoes not take a function -(assoc mymap :a 5).
– Lee
Mar 6 at 22:46
add a comment |
Alright, I'm new to clojure, this should be easy but for the life of me I can't find the answer
Let's say I have this map
(def mymap :a 10 :b 15)
Now I want to change the value of :a to 5. I don't know how to do this properly
I know update and assoc can make changes but they both receive a function as last argument, which applies to the value. I don't want that, I don't want any function to run, I just want to simply set :a to 5.
I think I can pass an anonymous function that simply returns 5 and ignores the arg, but is this the right way? Doesn't look good to me
(update mymap :a (fn [arg] 5))
clojure
asked Mar 6 at 22:04
GBarrosoGBarroso
147112
Alright, I'm new to clojure, this should be easy but for the life of me I can't find the answer
Let's say I have this map
(def mymap :a 10 :b 15)
Now I want to change the value of :a to 5. I don't know how to do this properly
I know update and assoc can make changes but they both receive a function as last argument, which applies to the value. I don't want that, I don't want any function to run, I just want to simply set :a to 5.
I think I can pass an anonymous function that simply returns 5 and ignores the arg, but is this the right way? Doesn't look good to me
(update mymap :a (fn [arg] 5))
clojure
clojure
asked Mar 6 at 22:04
GBarrosoGBarroso
147112
asked Mar 6 at 22:04
GBarrosoGBarroso
147112
asked Mar 6 at 22:04
GBarrosoGBarroso
147112
asked Mar 6 at 22:04
GBarrosoGBarroso
147112
asked Mar 6 at 22:04
GBarrosoGBarroso
147112
147112
1
associs what you're looking for; no last-arg function. clojuredocs.org/clojure.core/assoc
– Micah Elliott
Mar 6 at 22:19
1
assocdoes not take a function -(assoc mymap :a 5).
– Lee
Mar 6 at 22:46
add a comment |
1
associs what you're looking for; no last-arg function. clojuredocs.org/clojure.core/assoc
– Micah Elliott
Mar 6 at 22:19
1
assocdoes not take a function -(assoc mymap :a 5).
– Lee
Mar 6 at 22:46
1
1
assoc is what you're looking for; no last-arg function. clojuredocs.org/clojure.core/assoc– Micah Elliott
Mar 6 at 22:19
assoc is what you're looking for; no last-arg function. clojuredocs.org/clojure.core/assoc– Micah Elliott
Mar 6 at 22:19
1
1
assoc does not take a function - (assoc mymap :a 5).– Lee
Mar 6 at 22:46
assoc does not take a function - (assoc mymap :a 5).– Lee
Mar 6 at 22:46
add a comment |
1 Answer
1
active
oldest
votes
assoc does not take a function as its last argument; unless you were wanting to associate a function with a key in the map. (assoc mymap :a 5) does what you want.
I'll add though, update, which does take a function, could be used here as well when combined with constantly or just another function (although there's no reason to use it over assoc):
; constantly returns a function that throws away any arguments given to it,
; and "constantly" returns the given value
(update mymap :a (constantly 5))
; Basically the same as above
(update mymap :a (fn [_] 5))
answered Mar 6 at 22:54
CarcigenicateCarcigenicate
18.2k43262
add a comment |
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assoc does not take a function as its last argument; unless you were wanting to associate a function with a key in the map. (assoc mymap :a 5) does what you want.
I'll add though, update, which does take a function, could be used here as well when combined with constantly or just another function (although there's no reason to use it over assoc):
; constantly returns a function that throws away any arguments given to it,
; and "constantly" returns the given value
(update mymap :a (constantly 5))
; Basically the same as above
(update mymap :a (fn [_] 5))
answered Mar 6 at 22:54
CarcigenicateCarcigenicate
18.2k43262
add a comment |
assoc does not take a function as its last argument; unless you were wanting to associate a function with a key in the map. (assoc mymap :a 5) does what you want.
I'll add though, update, which does take a function, could be used here as well when combined with constantly or just another function (although there's no reason to use it over assoc):
; constantly returns a function that throws away any arguments given to it,
; and "constantly" returns the given value
(update mymap :a (constantly 5))
; Basically the same as above
(update mymap :a (fn [_] 5))
answered Mar 6 at 22:54
CarcigenicateCarcigenicate
18.2k43262
add a comment |
assoc does not take a function as its last argument; unless you were wanting to associate a function with a key in the map. (assoc mymap :a 5) does what you want.
I'll add though, update, which does take a function, could be used here as well when combined with constantly or just another function (although there's no reason to use it over assoc):
; constantly returns a function that throws away any arguments given to it,
; and "constantly" returns the given value
(update mymap :a (constantly 5))
; Basically the same as above
(update mymap :a (fn [_] 5))
answered Mar 6 at 22:54
CarcigenicateCarcigenicate
18.2k43262
assoc does not take a function as its last argument; unless you were wanting to associate a function with a key in the map. (assoc mymap :a 5) does what you want.
I'll add though, update, which does take a function, could be used here as well when combined with constantly or just another function (although there's no reason to use it over assoc):
; constantly returns a function that throws away any arguments given to it,
; and "constantly" returns the given value
(update mymap :a (constantly 5))
; Basically the same as above
(update mymap :a (fn [_] 5))
answered Mar 6 at 22:54
CarcigenicateCarcigenicate
18.2k43262
edited Mar 7 at 4:33
answered Mar 6 at 22:54
CarcigenicateCarcigenicate
18.2k43262
answered Mar 6 at 22:54
CarcigenicateCarcigenicate
18.2k43262
answered Mar 6 at 22:54
CarcigenicateCarcigenicate
18.2k43262
18.2k43262
add a comment |
add a comment |
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associs what you're looking for; no last-arg function. clojuredocs.org/clojure.core/assoc– Micah Elliott
Mar 6 at 22:19
1
assocdoes not take a function -(assoc mymap :a 5).– Lee
Mar 6 at 22:46