String manipulation in Clojure
I am new to Clojure. I have a java hashmap which has integer as keys and array list as values. The map is: {1=[Delhi, Goa, Mumbai], 2=[hello, world, the, world, is, awesome]}. I want to replace world with night and hello with good. I am doing something like this.
Clojure code:
(doseq [[k v] m]
(when (= k 2)
(doseq [s v]
(if (= s "world")
(def a(clojure.string/replace(s #"world" "night"))))
(if (= s "hello")
(def b(clojure.string/replace(s #"hello" "good")))))))
This doesn't work perfectly. Also when I try to print the value of a and b, it shows
#object[clojure.lang.Var$Unbound 0x31791dc5 Unbound: #'com.example.core/a] and #object[clojure.lang.Var$Unbound 0x31791dc5 Unbound: #'com.example.core/b].
How can I see the value of a i.e. night and b i.e. good. Is there any other way of string manipulation? Any help will be really appreciated.
java clojure
edited Dec 31 '18 at 16:26
cfrick
18.3k23552
asked Dec 31 '18 at 14:37
ditriditri
63
add a comment |
I am new to Clojure. I have a java hashmap which has integer as keys and array list as values. The map is: {1=[Delhi, Goa, Mumbai], 2=[hello, world, the, world, is, awesome]}. I want to replace world with night and hello with good. I am doing something like this.
Clojure code:
(doseq [[k v] m]
(when (= k 2)
(doseq [s v]
(if (= s "world")
(def a(clojure.string/replace(s #"world" "night"))))
(if (= s "hello")
(def b(clojure.string/replace(s #"hello" "good")))))))
This doesn't work perfectly. Also when I try to print the value of a and b, it shows
#object[clojure.lang.Var$Unbound 0x31791dc5 Unbound: #'com.example.core/a] and #object[clojure.lang.Var$Unbound 0x31791dc5 Unbound: #'com.example.core/b].
How can I see the value of a i.e. night and b i.e. good. Is there any other way of string manipulation? Any help will be really appreciated.
java clojure
edited Dec 31 '18 at 16:26
cfrick
18.3k23552
asked Dec 31 '18 at 14:37
ditriditri
63
6
You should start by reading a book like Clojure for the Brave and True, or another online resource. You're trying to write Clojure like it's Java, and that is going to make your life painful.
– Carcigenicate
Dec 31 '18 at 14:40
1
Only def in toplevel. Use let instead.
– cfrick
Dec 31 '18 at 16:15
add a comment |
I am new to Clojure. I have a java hashmap which has integer as keys and array list as values. The map is: {1=[Delhi, Goa, Mumbai], 2=[hello, world, the, world, is, awesome]}. I want to replace world with night and hello with good. I am doing something like this.
Clojure code:
(doseq [[k v] m]
(when (= k 2)
(doseq [s v]
(if (= s "world")
(def a(clojure.string/replace(s #"world" "night"))))
(if (= s "hello")
(def b(clojure.string/replace(s #"hello" "good")))))))
This doesn't work perfectly. Also when I try to print the value of a and b, it shows
#object[clojure.lang.Var$Unbound 0x31791dc5 Unbound: #'com.example.core/a] and #object[clojure.lang.Var$Unbound 0x31791dc5 Unbound: #'com.example.core/b].
How can I see the value of a i.e. night and b i.e. good. Is there any other way of string manipulation? Any help will be really appreciated.
java clojure
edited Dec 31 '18 at 16:26
cfrick
18.3k23552
asked Dec 31 '18 at 14:37
ditriditri
63
I am new to Clojure. I have a java hashmap which has integer as keys and array list as values. The map is: {1=[Delhi, Goa, Mumbai], 2=[hello, world, the, world, is, awesome]}. I want to replace world with night and hello with good. I am doing something like this.
Clojure code:
(doseq [[k v] m]
(when (= k 2)
(doseq [s v]
(if (= s "world")
(def a(clojure.string/replace(s #"world" "night"))))
(if (= s "hello")
(def b(clojure.string/replace(s #"hello" "good")))))))
This doesn't work perfectly. Also when I try to print the value of a and b, it shows
#object[clojure.lang.Var$Unbound 0x31791dc5 Unbound: #'com.example.core/a] and #object[clojure.lang.Var$Unbound 0x31791dc5 Unbound: #'com.example.core/b].
How can I see the value of a i.e. night and b i.e. good. Is there any other way of string manipulation? Any help will be really appreciated.
java clojure
java clojure
edited Dec 31 '18 at 16:26
cfrick
18.3k23552
asked Dec 31 '18 at 14:37
ditriditri
63
edited Dec 31 '18 at 16:26
cfrick
18.3k23552
asked Dec 31 '18 at 14:37
ditriditri
63
edited Dec 31 '18 at 16:26
cfrick
18.3k23552
edited Dec 31 '18 at 16:26
cfrick
18.3k23552
edited Dec 31 '18 at 16:26
cfrick
18.3k23552
18.3k23552
asked Dec 31 '18 at 14:37
ditriditri
63
asked Dec 31 '18 at 14:37
ditriditri
63
asked Dec 31 '18 at 14:37
ditriditri
63
63
6
You should start by reading a book like Clojure for the Brave and True, or another online resource. You're trying to write Clojure like it's Java, and that is going to make your life painful.
– Carcigenicate
Dec 31 '18 at 14:40
1
Only def in toplevel. Use let instead.
– cfrick
Dec 31 '18 at 16:15
add a comment |
6
You should start by reading a book like Clojure for the Brave and True, or another online resource. You're trying to write Clojure like it's Java, and that is going to make your life painful.
– Carcigenicate
Dec 31 '18 at 14:40
1
Only def in toplevel. Use let instead.
– cfrick
Dec 31 '18 at 16:15
6
6
You should start by reading a book like Clojure for the Brave and True, or another online resource. You're trying to write Clojure like it's Java, and that is going to make your life painful.
– Carcigenicate
Dec 31 '18 at 14:40
You should start by reading a book like Clojure for the Brave and True, or another online resource. You're trying to write Clojure like it's Java, and that is going to make your life painful.
– Carcigenicate
Dec 31 '18 at 14:40
1
1
Only def in toplevel. Use let instead.
– cfrick
Dec 31 '18 at 16:15
Only def in toplevel. Use let instead.
– cfrick
Dec 31 '18 at 16:15
add a comment |
2 Answers
2
active
oldest
votes
combination of update and replace would do the trick:
user> (def data {1 ["Delhi" "Goa" "Mumbai"]
2 ["hello" "world" "the" "world" "is" "awesome"]})
user> (update data 2 #(replace {"world" "night" "hello" "good"} %))
;;=> {1 ["Delhi" "Goa" "Mumbai"], 2 ["good" "night" "the" "night" "is" "awesome"]}
answered Jan 1 at 16:17
leetwinskileetwinski
10.6k1927
add a comment |
There's a couple of different ways to approach this. Let's say you've got
(def data {1 ["hello" "world"]})
The easy way
(def modified (assoc data 1 ["good" "night"]))
;; {1 ["good" "night"]}
This just returns a new data structure with the value at 1 swapped for a new vector of the appropriate elements. But that only works for fairly simple stuff where you know exactly what's in the vector.
The less easy way
(def result
(into (sorted-map)
(map
(fn [[k v]]
(if (some #{"hello" "world"} v)
[k (assoc (assoc v (.indexOf v "hello") "good")
(.indexOf v "world")
"night")]
[k v]))
(seq data))))
(print result) ; {1 ["good" "night"]}
Here, seq called on the map returns a lazy sequence of key/value tuples. We map over those with a function that checks for the values we want to replace and returns either a new key/value tuple with the words swapped at the appropriate indicies in the vector or the original if "hello"/"world" are not in the vector. Then into turns it back into a map.
answered Dec 31 '18 at 14:52
Jared SmithJared Smith
9,59632043
add a comment |
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2 Answers
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active
oldest
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2 Answers
2
active
oldest
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active
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active
oldest
votes
combination of update and replace would do the trick:
user> (def data {1 ["Delhi" "Goa" "Mumbai"]
2 ["hello" "world" "the" "world" "is" "awesome"]})
user> (update data 2 #(replace {"world" "night" "hello" "good"} %))
;;=> {1 ["Delhi" "Goa" "Mumbai"], 2 ["good" "night" "the" "night" "is" "awesome"]}
answered Jan 1 at 16:17
leetwinskileetwinski
10.6k1927
add a comment |
combination of update and replace would do the trick:
user> (def data {1 ["Delhi" "Goa" "Mumbai"]
2 ["hello" "world" "the" "world" "is" "awesome"]})
user> (update data 2 #(replace {"world" "night" "hello" "good"} %))
;;=> {1 ["Delhi" "Goa" "Mumbai"], 2 ["good" "night" "the" "night" "is" "awesome"]}
answered Jan 1 at 16:17
leetwinskileetwinski
10.6k1927
add a comment |
combination of update and replace would do the trick:
user> (def data {1 ["Delhi" "Goa" "Mumbai"]
2 ["hello" "world" "the" "world" "is" "awesome"]})
user> (update data 2 #(replace {"world" "night" "hello" "good"} %))
;;=> {1 ["Delhi" "Goa" "Mumbai"], 2 ["good" "night" "the" "night" "is" "awesome"]}
answered Jan 1 at 16:17
leetwinskileetwinski
10.6k1927
combination of update and replace would do the trick:
user> (def data {1 ["Delhi" "Goa" "Mumbai"]
2 ["hello" "world" "the" "world" "is" "awesome"]})
user> (update data 2 #(replace {"world" "night" "hello" "good"} %))
;;=> {1 ["Delhi" "Goa" "Mumbai"], 2 ["good" "night" "the" "night" "is" "awesome"]}
answered Jan 1 at 16:17
leetwinskileetwinski
10.6k1927
answered Jan 1 at 16:17
leetwinskileetwinski
10.6k1927
answered Jan 1 at 16:17
leetwinskileetwinski
10.6k1927
answered Jan 1 at 16:17
leetwinskileetwinski
10.6k1927
10.6k1927
add a comment |
add a comment |
There's a couple of different ways to approach this. Let's say you've got
(def data {1 ["hello" "world"]})
The easy way
(def modified (assoc data 1 ["good" "night"]))
;; {1 ["good" "night"]}
This just returns a new data structure with the value at 1 swapped for a new vector of the appropriate elements. But that only works for fairly simple stuff where you know exactly what's in the vector.
The less easy way
(def result
(into (sorted-map)
(map
(fn [[k v]]
(if (some #{"hello" "world"} v)
[k (assoc (assoc v (.indexOf v "hello") "good")
(.indexOf v "world")
"night")]
[k v]))
(seq data))))
(print result) ; {1 ["good" "night"]}
Here, seq called on the map returns a lazy sequence of key/value tuples. We map over those with a function that checks for the values we want to replace and returns either a new key/value tuple with the words swapped at the appropriate indicies in the vector or the original if "hello"/"world" are not in the vector. Then into turns it back into a map.
answered Dec 31 '18 at 14:52
Jared SmithJared Smith
9,59632043
add a comment |
There's a couple of different ways to approach this. Let's say you've got
(def data {1 ["hello" "world"]})
The easy way
(def modified (assoc data 1 ["good" "night"]))
;; {1 ["good" "night"]}
This just returns a new data structure with the value at 1 swapped for a new vector of the appropriate elements. But that only works for fairly simple stuff where you know exactly what's in the vector.
The less easy way
(def result
(into (sorted-map)
(map
(fn [[k v]]
(if (some #{"hello" "world"} v)
[k (assoc (assoc v (.indexOf v "hello") "good")
(.indexOf v "world")
"night")]
[k v]))
(seq data))))
(print result) ; {1 ["good" "night"]}
Here, seq called on the map returns a lazy sequence of key/value tuples. We map over those with a function that checks for the values we want to replace and returns either a new key/value tuple with the words swapped at the appropriate indicies in the vector or the original if "hello"/"world" are not in the vector. Then into turns it back into a map.
answered Dec 31 '18 at 14:52
Jared SmithJared Smith
9,59632043
add a comment |
There's a couple of different ways to approach this. Let's say you've got
(def data {1 ["hello" "world"]})
The easy way
(def modified (assoc data 1 ["good" "night"]))
;; {1 ["good" "night"]}
This just returns a new data structure with the value at 1 swapped for a new vector of the appropriate elements. But that only works for fairly simple stuff where you know exactly what's in the vector.
The less easy way
(def result
(into (sorted-map)
(map
(fn [[k v]]
(if (some #{"hello" "world"} v)
[k (assoc (assoc v (.indexOf v "hello") "good")
(.indexOf v "world")
"night")]
[k v]))
(seq data))))
(print result) ; {1 ["good" "night"]}
Here, seq called on the map returns a lazy sequence of key/value tuples. We map over those with a function that checks for the values we want to replace and returns either a new key/value tuple with the words swapped at the appropriate indicies in the vector or the original if "hello"/"world" are not in the vector. Then into turns it back into a map.
answered Dec 31 '18 at 14:52
Jared SmithJared Smith
9,59632043
There's a couple of different ways to approach this. Let's say you've got
(def data {1 ["hello" "world"]})
The easy way
(def modified (assoc data 1 ["good" "night"]))
;; {1 ["good" "night"]}
This just returns a new data structure with the value at 1 swapped for a new vector of the appropriate elements. But that only works for fairly simple stuff where you know exactly what's in the vector.
The less easy way
(def result
(into (sorted-map)
(map
(fn [[k v]]
(if (some #{"hello" "world"} v)
[k (assoc (assoc v (.indexOf v "hello") "good")
(.indexOf v "world")
"night")]
[k v]))
(seq data))))
(print result) ; {1 ["good" "night"]}
Here, seq called on the map returns a lazy sequence of key/value tuples. We map over those with a function that checks for the values we want to replace and returns either a new key/value tuple with the words swapped at the appropriate indicies in the vector or the original if "hello"/"world" are not in the vector. Then into turns it back into a map.
answered Dec 31 '18 at 14:52
Jared SmithJared Smith
9,59632043
edited Jan 1 at 13:36
answered Dec 31 '18 at 14:52
Jared SmithJared Smith
9,59632043
answered Dec 31 '18 at 14:52
Jared SmithJared Smith
9,59632043
answered Dec 31 '18 at 14:52
Jared SmithJared Smith
9,59632043
9,59632043
add a comment |
add a comment |
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6
You should start by reading a book like Clojure for the Brave and True, or another online resource. You're trying to write Clojure like it's Java, and that is going to make your life painful.
– Carcigenicate
Dec 31 '18 at 14:40
1
Only def in toplevel. Use let instead.
– cfrick
Dec 31 '18 at 16:15