Mixing
In clojure can you apply a function to all elements in a collection and have the return value be the input...
Say you have a collection like this ({A: 1 B: 2} {A: 2 B: 5} {A: 4 B: 7}) with an unspecified amount of {A: B:} parts and a function (func arg1 arg2).
If we assume there is some initial state state and that every call to func generates a new-state.
Is it possible to construct something that acts like this?
(->(func state {A: 1 B: 2})
(func {A: 2 B: 5})
(func {A: 4 B: 7}))
Basically the first argument is the new state and the second is the next {A: B:} from the collection.
Any help would be appreciated!
function collections clojure
asked Nov 19 '18 at 13:25
John Slaine
748
add a comment |
Say you have a collection like this ({A: 1 B: 2} {A: 2 B: 5} {A: 4 B: 7}) with an unspecified amount of {A: B:} parts and a function (func arg1 arg2).
If we assume there is some initial state state and that every call to func generates a new-state.
Is it possible to construct something that acts like this?
(->(func state {A: 1 B: 2})
(func {A: 2 B: 5})
(func {A: 4 B: 7}))
Basically the first argument is the new state and the second is the next {A: B:} from the collection.
Any help would be appreciated!
function collections clojure
asked Nov 19 '18 at 13:25
John Slaine
748
As a side note,{:a 1 :b 2}would be more commonly seen in Clojure. I.e., using keywords for the keys of a map. Though,{A: 1 B: 2}is syntactical legal.
– celwell
Nov 21 '18 at 5:03
add a comment |
Say you have a collection like this ({A: 1 B: 2} {A: 2 B: 5} {A: 4 B: 7}) with an unspecified amount of {A: B:} parts and a function (func arg1 arg2).
If we assume there is some initial state state and that every call to func generates a new-state.
Is it possible to construct something that acts like this?
(->(func state {A: 1 B: 2})
(func {A: 2 B: 5})
(func {A: 4 B: 7}))
Basically the first argument is the new state and the second is the next {A: B:} from the collection.
Any help would be appreciated!
function collections clojure
asked Nov 19 '18 at 13:25
John Slaine
748
Say you have a collection like this ({A: 1 B: 2} {A: 2 B: 5} {A: 4 B: 7}) with an unspecified amount of {A: B:} parts and a function (func arg1 arg2).
If we assume there is some initial state state and that every call to func generates a new-state.
Is it possible to construct something that acts like this?
(->(func state {A: 1 B: 2})
(func {A: 2 B: 5})
(func {A: 4 B: 7}))
Basically the first argument is the new state and the second is the next {A: B:} from the collection.
Any help would be appreciated!
function collections clojure
function collections clojure
asked Nov 19 '18 at 13:25
John Slaine
748
asked Nov 19 '18 at 13:25
John Slaine
748
edited Nov 19 '18 at 13:45
asked Nov 19 '18 at 13:25
John Slaine
748
asked Nov 19 '18 at 13:25
John Slaine
748
asked Nov 19 '18 at 13:25
John Slaine
748
748
As a side note,{:a 1 :b 2}would be more commonly seen in Clojure. I.e., using keywords for the keys of a map. Though,{A: 1 B: 2}is syntactical legal.
– celwell
Nov 21 '18 at 5:03
add a comment |
As a side note,{:a 1 :b 2}would be more commonly seen in Clojure. I.e., using keywords for the keys of a map. Though,{A: 1 B: 2}is syntactical legal.
– celwell
Nov 21 '18 at 5:03
As a side note,
{:a 1 :b 2} would be more commonly seen in Clojure. I.e., using keywords for the keys of a map. Though, {A: 1 B: 2} is syntactical legal.– celwell
Nov 21 '18 at 5:03
As a side note,
{:a 1 :b 2} would be more commonly seen in Clojure. I.e., using keywords for the keys of a map. Though, {A: 1 B: 2} is syntactical legal.– celwell
Nov 21 '18 at 5:03
add a comment |
1 Answer
1
active
oldest
votes
Yes, this function is called reduce:
(reduce
func
initial-state
input-sequence)
or a version where the first element of the input sequence is used as initial state (check the function doc to see the details of its behaviour):
(reduce
func
input-sequence)
For example:
(reduce
+
100
[1 2 3 4 5])
;; => 115
(reduce
+
[1 2 3 4 5])
;; => 15
answered Nov 19 '18 at 13:30
Piotrek Bzdyl
10.3k11930
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Yes, this function is called reduce:
(reduce
func
initial-state
input-sequence)
or a version where the first element of the input sequence is used as initial state (check the function doc to see the details of its behaviour):
(reduce
func
input-sequence)
For example:
(reduce
+
100
[1 2 3 4 5])
;; => 115
(reduce
+
[1 2 3 4 5])
;; => 15
answered Nov 19 '18 at 13:30
Piotrek Bzdyl
10.3k11930
add a comment |
Yes, this function is called reduce:
(reduce
func
initial-state
input-sequence)
or a version where the first element of the input sequence is used as initial state (check the function doc to see the details of its behaviour):
(reduce
func
input-sequence)
For example:
(reduce
+
100
[1 2 3 4 5])
;; => 115
(reduce
+
[1 2 3 4 5])
;; => 15
answered Nov 19 '18 at 13:30
Piotrek Bzdyl
10.3k11930
add a comment |
Yes, this function is called reduce:
(reduce
func
initial-state
input-sequence)
or a version where the first element of the input sequence is used as initial state (check the function doc to see the details of its behaviour):
(reduce
func
input-sequence)
For example:
(reduce
+
100
[1 2 3 4 5])
;; => 115
(reduce
+
[1 2 3 4 5])
;; => 15
answered Nov 19 '18 at 13:30
Piotrek Bzdyl
10.3k11930
Yes, this function is called reduce:
(reduce
func
initial-state
input-sequence)
or a version where the first element of the input sequence is used as initial state (check the function doc to see the details of its behaviour):
(reduce
func
input-sequence)
For example:
(reduce
+
100
[1 2 3 4 5])
;; => 115
(reduce
+
[1 2 3 4 5])
;; => 15
answered Nov 19 '18 at 13:30
Piotrek Bzdyl
10.3k11930
edited Nov 19 '18 at 17:18
answered Nov 19 '18 at 13:30
Piotrek Bzdyl
10.3k11930
answered Nov 19 '18 at 13:30
Piotrek Bzdyl
10.3k11930
answered Nov 19 '18 at 13:30
Piotrek Bzdyl
10.3k11930
10.3k11930
add a comment |
add a comment |
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As a side note,
{:a 1 :b 2}would be more commonly seen in Clojure. I.e., using keywords for the keys of a map. Though,{A: 1 B: 2}is syntactical legal.– celwell
Nov 21 '18 at 5:03