In clojure, how can I select and return a subset of a collection
0
If I have a collection like this
{{:A "a" :B "b"} {:A "a" :B "Goal" } {:A "a" :B "Goal"}}
how do I make a function so it returns only the parts where :B "Goal"? Meaning only:
{{:A "a" :B "Goal" } {:A "a" :B "Goal"}}
collections clojure
asked Nov 20 '18 at 23:36
John SlaineJohn Slaine
748
add a comment |
0
If I have a collection like this
{{:A "a" :B "b"} {:A "a" :B "Goal" } {:A "a" :B "Goal"}}
how do I make a function so it returns only the parts where :B "Goal"? Meaning only:
{{:A "a" :B "Goal" } {:A "a" :B "Goal"}}
collections clojure
asked Nov 20 '18 at 23:36
John SlaineJohn Slaine
748
curly brackets are maps in Clojure and require an even number of members (key and value pairs) they can be of any type : keyword, string, number.. your collection above will be better represented as a vector[,,,]or a list'(,,,)
– manandearth
Nov 21 '18 at 17:35
add a comment |
0
0
0
If I have a collection like this
{{:A "a" :B "b"} {:A "a" :B "Goal" } {:A "a" :B "Goal"}}
how do I make a function so it returns only the parts where :B "Goal"? Meaning only:
{{:A "a" :B "Goal" } {:A "a" :B "Goal"}}
collections clojure
asked Nov 20 '18 at 23:36
John SlaineJohn Slaine
748
If I have a collection like this
{{:A "a" :B "b"} {:A "a" :B "Goal" } {:A "a" :B "Goal"}}
how do I make a function so it returns only the parts where :B "Goal"? Meaning only:
{{:A "a" :B "Goal" } {:A "a" :B "Goal"}}
collections clojure
collections clojure
asked Nov 20 '18 at 23:36
John SlaineJohn Slaine
748
asked Nov 20 '18 at 23:36
John SlaineJohn Slaine
748
asked Nov 20 '18 at 23:36
John SlaineJohn Slaine
748
asked Nov 20 '18 at 23:36
John SlaineJohn Slaine
748
asked Nov 20 '18 at 23:36
John SlaineJohn Slaine
748
748
curly brackets are maps in Clojure and require an even number of members (key and value pairs) they can be of any type : keyword, string, number.. your collection above will be better represented as a vector[,,,]or a list'(,,,)
– manandearth
Nov 21 '18 at 17:35
add a comment |
curly brackets are maps in Clojure and require an even number of members (key and value pairs) they can be of any type : keyword, string, number.. your collection above will be better represented as a vector[,,,]or a list'(,,,)
– manandearth
Nov 21 '18 at 17:35
curly brackets are maps in Clojure and require an even number of members (key and value pairs) they can be of any type : keyword, string, number.. your collection above will be better represented as a vector
[,,,] or a list'(,,,)– manandearth
Nov 21 '18 at 17:35
curly brackets are maps in Clojure and require an even number of members (key and value pairs) they can be of any type : keyword, string, number.. your collection above will be better represented as a vector
[,,,] or a list'(,,,)– manandearth
Nov 21 '18 at 17:35
add a comment |
1 Answer
1
active
oldest
votes
6
I fixed your data to make it a vector of 3 maps.
(def data [{:A "a" :B "b"}
{:A "a" :B "Goal"}
{:A "a" :B "Goal"}])
(defn b-goal?
[item]
(= (:B item) "Goal") )
(filter b-goal? data) => ({:A "a", :B "Goal"} {:A "a", :B "Goal"})
Be sure also to check out:
- The Clojure CheatSheet
- Clojure for the Brave and True
As well as books like
- Living Clojure
- Getting Clojure
answered Nov 20 '18 at 23:49
Alan ThompsonAlan Thompson
13.3k22533
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
6
I fixed your data to make it a vector of 3 maps.
(def data [{:A "a" :B "b"}
{:A "a" :B "Goal"}
{:A "a" :B "Goal"}])
(defn b-goal?
[item]
(= (:B item) "Goal") )
(filter b-goal? data) => ({:A "a", :B "Goal"} {:A "a", :B "Goal"})
Be sure also to check out:
- The Clojure CheatSheet
- Clojure for the Brave and True
As well as books like
- Living Clojure
- Getting Clojure
answered Nov 20 '18 at 23:49
Alan ThompsonAlan Thompson
13.3k22533
add a comment |
6
I fixed your data to make it a vector of 3 maps.
(def data [{:A "a" :B "b"}
{:A "a" :B "Goal"}
{:A "a" :B "Goal"}])
(defn b-goal?
[item]
(= (:B item) "Goal") )
(filter b-goal? data) => ({:A "a", :B "Goal"} {:A "a", :B "Goal"})
Be sure also to check out:
- The Clojure CheatSheet
- Clojure for the Brave and True
As well as books like
- Living Clojure
- Getting Clojure
answered Nov 20 '18 at 23:49
Alan ThompsonAlan Thompson
13.3k22533
add a comment |
6
6
6
I fixed your data to make it a vector of 3 maps.
(def data [{:A "a" :B "b"}
{:A "a" :B "Goal"}
{:A "a" :B "Goal"}])
(defn b-goal?
[item]
(= (:B item) "Goal") )
(filter b-goal? data) => ({:A "a", :B "Goal"} {:A "a", :B "Goal"})
Be sure also to check out:
- The Clojure CheatSheet
- Clojure for the Brave and True
As well as books like
- Living Clojure
- Getting Clojure
answered Nov 20 '18 at 23:49
Alan ThompsonAlan Thompson
13.3k22533
I fixed your data to make it a vector of 3 maps.
(def data [{:A "a" :B "b"}
{:A "a" :B "Goal"}
{:A "a" :B "Goal"}])
(defn b-goal?
[item]
(= (:B item) "Goal") )
(filter b-goal? data) => ({:A "a", :B "Goal"} {:A "a", :B "Goal"})
Be sure also to check out:
- The Clojure CheatSheet
- Clojure for the Brave and True
As well as books like
- Living Clojure
- Getting Clojure
answered Nov 20 '18 at 23:49
Alan ThompsonAlan Thompson
13.3k22533
edited Nov 21 '18 at 1:43
answered Nov 20 '18 at 23:49
Alan ThompsonAlan Thompson
13.3k22533
answered Nov 20 '18 at 23:49
Alan ThompsonAlan Thompson
13.3k22533
answered Nov 20 '18 at 23:49
Alan ThompsonAlan Thompson
13.3k22533
13.3k22533
add a comment |
add a comment |
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curly brackets are maps in Clojure and require an even number of members (key and value pairs) they can be of any type : keyword, string, number.. your collection above will be better represented as a vector
[,,,]or a list'(,,,)– manandearth
Nov 21 '18 at 17:35