Scala string interpolation from collections - n number of variables
0
I want to interpolate a string pattern from a scala collection (Map, Seq, Hashtable) and populate a path to file.
${directory}/data/${fileName}
My collection is a Map[String,String] which holds directory and file values
args.directory and args.fileName
input from config file
path_to_file: ${directory}/data/${fileName}
input from command args:
directory=/temp,fileName=data.json
output:
path_to_file = /temp/data/data.json
any suggestions?
scala string-interpolation
asked Nov 14 '18 at 17:27
Rio Amarillo Rio Amarillo
32
|
show 5 more comments
0
I want to interpolate a string pattern from a scala collection (Map, Seq, Hashtable) and populate a path to file.
${directory}/data/${fileName}
My collection is a Map[String,String] which holds directory and file values
args.directory and args.fileName
input from config file
path_to_file: ${directory}/data/${fileName}
input from command args:
directory=/temp,fileName=data.json
output:
path_to_file = /temp/data/data.json
any suggestions?
scala string-interpolation
asked Nov 14 '18 at 17:27
Rio Amarillo Rio Amarillo
32
use it like this s"${directory}/data/${fileName}" it should work
– Raman Mishra
Nov 14 '18 at 17:33
and the map should be like Map[String, List[String]] as value can me more than one file in a directory?
– Raman Mishra
Nov 14 '18 at 17:35
my interpolated (to be) values come as a Map Collection and for the interpolation pattern that you have offered you need declared vars in the scope of the s (sugar function)
– Rio Amarillo
Nov 14 '18 at 17:37
it's not necessary that you declare a var you can use ListBuffer
– Raman Mishra
Nov 14 '18 at 17:39
example por favor
– Rio Amarillo
Nov 14 '18 at 17:39
|
show 5 more comments
0
0
0
I want to interpolate a string pattern from a scala collection (Map, Seq, Hashtable) and populate a path to file.
${directory}/data/${fileName}
My collection is a Map[String,String] which holds directory and file values
args.directory and args.fileName
input from config file
path_to_file: ${directory}/data/${fileName}
input from command args:
directory=/temp,fileName=data.json
output:
path_to_file = /temp/data/data.json
any suggestions?
scala string-interpolation
asked Nov 14 '18 at 17:27
Rio Amarillo Rio Amarillo
32
I want to interpolate a string pattern from a scala collection (Map, Seq, Hashtable) and populate a path to file.
${directory}/data/${fileName}
My collection is a Map[String,String] which holds directory and file values
args.directory and args.fileName
input from config file
path_to_file: ${directory}/data/${fileName}
input from command args:
directory=/temp,fileName=data.json
output:
path_to_file = /temp/data/data.json
any suggestions?
scala string-interpolation
scala string-interpolation
asked Nov 14 '18 at 17:27
Rio Amarillo Rio Amarillo
32
asked Nov 14 '18 at 17:27
Rio Amarillo Rio Amarillo
32
edited Nov 14 '18 at 17:50
Rio Amarillo
asked Nov 14 '18 at 17:27
Rio Amarillo Rio Amarillo
32
asked Nov 14 '18 at 17:27
Rio Amarillo Rio Amarillo
32
asked Nov 14 '18 at 17:27
Rio Amarillo Rio Amarillo
32
32
use it like this s"${directory}/data/${fileName}" it should work
– Raman Mishra
Nov 14 '18 at 17:33
and the map should be like Map[String, List[String]] as value can me more than one file in a directory?
– Raman Mishra
Nov 14 '18 at 17:35
my interpolated (to be) values come as a Map Collection and for the interpolation pattern that you have offered you need declared vars in the scope of the s (sugar function)
– Rio Amarillo
Nov 14 '18 at 17:37
it's not necessary that you declare a var you can use ListBuffer
– Raman Mishra
Nov 14 '18 at 17:39
example por favor
– Rio Amarillo
Nov 14 '18 at 17:39
|
show 5 more comments
use it like this s"${directory}/data/${fileName}" it should work
– Raman Mishra
Nov 14 '18 at 17:33
and the map should be like Map[String, List[String]] as value can me more than one file in a directory?
– Raman Mishra
Nov 14 '18 at 17:35
my interpolated (to be) values come as a Map Collection and for the interpolation pattern that you have offered you need declared vars in the scope of the s (sugar function)
– Rio Amarillo
Nov 14 '18 at 17:37
it's not necessary that you declare a var you can use ListBuffer
– Raman Mishra
Nov 14 '18 at 17:39
example por favor
– Rio Amarillo
Nov 14 '18 at 17:39
use it like this s"${directory}/data/${fileName}" it should work
– Raman Mishra
Nov 14 '18 at 17:33
use it like this s"${directory}/data/${fileName}" it should work
– Raman Mishra
Nov 14 '18 at 17:33
and the map should be like Map[String, List[String]] as value can me more than one file in a directory?
– Raman Mishra
Nov 14 '18 at 17:35
and the map should be like Map[String, List[String]] as value can me more than one file in a directory?
– Raman Mishra
Nov 14 '18 at 17:35
my interpolated (to be) values come as a Map Collection and for the interpolation pattern that you have offered you need declared vars in the scope of the s (sugar function)
– Rio Amarillo
Nov 14 '18 at 17:37
my interpolated (to be) values come as a Map Collection and for the interpolation pattern that you have offered you need declared vars in the scope of the s (sugar function)
– Rio Amarillo
Nov 14 '18 at 17:37
it's not necessary that you declare a var you can use ListBuffer
– Raman Mishra
Nov 14 '18 at 17:39
it's not necessary that you declare a var you can use ListBuffer
– Raman Mishra
Nov 14 '18 at 17:39
example por favor
– Rio Amarillo
Nov 14 '18 at 17:39
example por favor
– Rio Amarillo
Nov 14 '18 at 17:39
|
show 5 more comments
2 Answers
2
active
oldest
votes
-1
As you have described that you have Map[String,String]
val args:Map[String, String] = ("dir1" -> "file1","dir2"-> "file2")
val result = args.map{ keyValue =>
s"${keyValue._1}/data/${keyValue._2}"
}
and result will have all the paths.
as Dima suggested if you have something like
Map("directory"->"temp", "fileName"->"data.json")
then you can do it like this:
val path = s"${args("directory")}/data/${args("fileName")}"
answered Nov 14 '18 at 17:54
Raman MishraRaman Mishra
1,3861417
You don't need mutable collections for doing stuff like this.args.map { case (k,v) => s"$k/data/$v" }will do.
– Dima
Nov 14 '18 at 20:03
I am considering map has more than one value @Dima that's why i am using mutable.ListBuffer yes if it has only 2 keys we don't need it I agree. But it doesn't looks like he has only two keys!
– Raman Mishra
Nov 15 '18 at 5:06
it doesn't matter how many values. The snippet I showed above works for any number of them.
– Dima
Nov 15 '18 at 11:49
what if there is more keys? will it work for them too? i don't think so @Dima we will have to iterate over then in that condition and then will save paths for each key value. Suppose it has 2 values for directory -> List("temp", "temp1") so your code snippet will print "/List(temp, temp1)/data/data.json".
– Raman Mishra
Nov 15 '18 at 11:53
Yes, this is written to fit the example in your your answer. If values are lists, your code doesn't work too. You'd have to write it differently then ... but still don't need mutable containers.
– Dima
Nov 15 '18 at 11:56
|
show 5 more comments
1
If you have something like val args = Map("filename" -> "data.json", "directory" -> "temp"),
then s"${args("directory")}/data/${args("filename")}" will evaluate to "/temp/data/data.json"
answered Nov 14 '18 at 18:10
DimaDima
25.1k32236
answer will hold only if it has only two keys!! but the idea is right i have updated my answer thank you!!
– Raman Mishra
Nov 14 '18 at 18:40
Well, yeah ... that's what he said:my collection looks like this: [fileName, 'someVal'] [Directory, 'someVal']So ... two keys.
– Dima
Nov 14 '18 at 19:59
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
-1
As you have described that you have Map[String,String]
val args:Map[String, String] = ("dir1" -> "file1","dir2"-> "file2")
val result = args.map{ keyValue =>
s"${keyValue._1}/data/${keyValue._2}"
}
and result will have all the paths.
as Dima suggested if you have something like
Map("directory"->"temp", "fileName"->"data.json")
then you can do it like this:
val path = s"${args("directory")}/data/${args("fileName")}"
answered Nov 14 '18 at 17:54
Raman MishraRaman Mishra
1,3861417
You don't need mutable collections for doing stuff like this.args.map { case (k,v) => s"$k/data/$v" }will do.
– Dima
Nov 14 '18 at 20:03
I am considering map has more than one value @Dima that's why i am using mutable.ListBuffer yes if it has only 2 keys we don't need it I agree. But it doesn't looks like he has only two keys!
– Raman Mishra
Nov 15 '18 at 5:06
it doesn't matter how many values. The snippet I showed above works for any number of them.
– Dima
Nov 15 '18 at 11:49
what if there is more keys? will it work for them too? i don't think so @Dima we will have to iterate over then in that condition and then will save paths for each key value. Suppose it has 2 values for directory -> List("temp", "temp1") so your code snippet will print "/List(temp, temp1)/data/data.json".
– Raman Mishra
Nov 15 '18 at 11:53
Yes, this is written to fit the example in your your answer. If values are lists, your code doesn't work too. You'd have to write it differently then ... but still don't need mutable containers.
– Dima
Nov 15 '18 at 11:56
|
show 5 more comments
-1
As you have described that you have Map[String,String]
val args:Map[String, String] = ("dir1" -> "file1","dir2"-> "file2")
val result = args.map{ keyValue =>
s"${keyValue._1}/data/${keyValue._2}"
}
and result will have all the paths.
as Dima suggested if you have something like
Map("directory"->"temp", "fileName"->"data.json")
then you can do it like this:
val path = s"${args("directory")}/data/${args("fileName")}"
answered Nov 14 '18 at 17:54
Raman MishraRaman Mishra
1,3861417
You don't need mutable collections for doing stuff like this.args.map { case (k,v) => s"$k/data/$v" }will do.
– Dima
Nov 14 '18 at 20:03
I am considering map has more than one value @Dima that's why i am using mutable.ListBuffer yes if it has only 2 keys we don't need it I agree. But it doesn't looks like he has only two keys!
– Raman Mishra
Nov 15 '18 at 5:06
it doesn't matter how many values. The snippet I showed above works for any number of them.
– Dima
Nov 15 '18 at 11:49
what if there is more keys? will it work for them too? i don't think so @Dima we will have to iterate over then in that condition and then will save paths for each key value. Suppose it has 2 values for directory -> List("temp", "temp1") so your code snippet will print "/List(temp, temp1)/data/data.json".
– Raman Mishra
Nov 15 '18 at 11:53
Yes, this is written to fit the example in your your answer. If values are lists, your code doesn't work too. You'd have to write it differently then ... but still don't need mutable containers.
– Dima
Nov 15 '18 at 11:56
|
show 5 more comments
-1
-1
-1
As you have described that you have Map[String,String]
val args:Map[String, String] = ("dir1" -> "file1","dir2"-> "file2")
val result = args.map{ keyValue =>
s"${keyValue._1}/data/${keyValue._2}"
}
and result will have all the paths.
as Dima suggested if you have something like
Map("directory"->"temp", "fileName"->"data.json")
then you can do it like this:
val path = s"${args("directory")}/data/${args("fileName")}"
answered Nov 14 '18 at 17:54
Raman MishraRaman Mishra
1,3861417
As you have described that you have Map[String,String]
val args:Map[String, String] = ("dir1" -> "file1","dir2"-> "file2")
val result = args.map{ keyValue =>
s"${keyValue._1}/data/${keyValue._2}"
}
and result will have all the paths.
as Dima suggested if you have something like
Map("directory"->"temp", "fileName"->"data.json")
then you can do it like this:
val path = s"${args("directory")}/data/${args("fileName")}"
answered Nov 14 '18 at 17:54
Raman MishraRaman Mishra
1,3861417
edited Nov 15 '18 at 12:23
answered Nov 14 '18 at 17:54
Raman MishraRaman Mishra
1,3861417
answered Nov 14 '18 at 17:54
Raman MishraRaman Mishra
1,3861417
answered Nov 14 '18 at 17:54
Raman MishraRaman Mishra
1,3861417
1,3861417
You don't need mutable collections for doing stuff like this.args.map { case (k,v) => s"$k/data/$v" }will do.
– Dima
Nov 14 '18 at 20:03
I am considering map has more than one value @Dima that's why i am using mutable.ListBuffer yes if it has only 2 keys we don't need it I agree. But it doesn't looks like he has only two keys!
– Raman Mishra
Nov 15 '18 at 5:06
it doesn't matter how many values. The snippet I showed above works for any number of them.
– Dima
Nov 15 '18 at 11:49
what if there is more keys? will it work for them too? i don't think so @Dima we will have to iterate over then in that condition and then will save paths for each key value. Suppose it has 2 values for directory -> List("temp", "temp1") so your code snippet will print "/List(temp, temp1)/data/data.json".
– Raman Mishra
Nov 15 '18 at 11:53
Yes, this is written to fit the example in your your answer. If values are lists, your code doesn't work too. You'd have to write it differently then ... but still don't need mutable containers.
– Dima
Nov 15 '18 at 11:56
|
show 5 more comments
You don't need mutable collections for doing stuff like this.args.map { case (k,v) => s"$k/data/$v" }will do.
– Dima
Nov 14 '18 at 20:03
I am considering map has more than one value @Dima that's why i am using mutable.ListBuffer yes if it has only 2 keys we don't need it I agree. But it doesn't looks like he has only two keys!
– Raman Mishra
Nov 15 '18 at 5:06
it doesn't matter how many values. The snippet I showed above works for any number of them.
– Dima
Nov 15 '18 at 11:49
what if there is more keys? will it work for them too? i don't think so @Dima we will have to iterate over then in that condition and then will save paths for each key value. Suppose it has 2 values for directory -> List("temp", "temp1") so your code snippet will print "/List(temp, temp1)/data/data.json".
– Raman Mishra
Nov 15 '18 at 11:53
Yes, this is written to fit the example in your your answer. If values are lists, your code doesn't work too. You'd have to write it differently then ... but still don't need mutable containers.
– Dima
Nov 15 '18 at 11:56
You don't need mutable collections for doing stuff like this.
args.map { case (k,v) => s"$k/data/$v" } will do.– Dima
Nov 14 '18 at 20:03
You don't need mutable collections for doing stuff like this.
args.map { case (k,v) => s"$k/data/$v" } will do.– Dima
Nov 14 '18 at 20:03
I am considering map has more than one value @Dima that's why i am using mutable.ListBuffer yes if it has only 2 keys we don't need it I agree. But it doesn't looks like he has only two keys!
– Raman Mishra
Nov 15 '18 at 5:06
I am considering map has more than one value @Dima that's why i am using mutable.ListBuffer yes if it has only 2 keys we don't need it I agree. But it doesn't looks like he has only two keys!
– Raman Mishra
Nov 15 '18 at 5:06
it doesn't matter how many values. The snippet I showed above works for any number of them.
– Dima
Nov 15 '18 at 11:49
it doesn't matter how many values. The snippet I showed above works for any number of them.
– Dima
Nov 15 '18 at 11:49
what if there is more keys? will it work for them too? i don't think so @Dima we will have to iterate over then in that condition and then will save paths for each key value. Suppose it has 2 values for directory -> List("temp", "temp1") so your code snippet will print "/List(temp, temp1)/data/data.json".
– Raman Mishra
Nov 15 '18 at 11:53
what if there is more keys? will it work for them too? i don't think so @Dima we will have to iterate over then in that condition and then will save paths for each key value. Suppose it has 2 values for directory -> List("temp", "temp1") so your code snippet will print "/List(temp, temp1)/data/data.json".
– Raman Mishra
Nov 15 '18 at 11:53
Yes, this is written to fit the example in your your answer. If values are lists, your code doesn't work too. You'd have to write it differently then ... but still don't need mutable containers.
– Dima
Nov 15 '18 at 11:56
Yes, this is written to fit the example in your your answer. If values are lists, your code doesn't work too. You'd have to write it differently then ... but still don't need mutable containers.
– Dima
Nov 15 '18 at 11:56
|
show 5 more comments
1
If you have something like val args = Map("filename" -> "data.json", "directory" -> "temp"),
then s"${args("directory")}/data/${args("filename")}" will evaluate to "/temp/data/data.json"
answered Nov 14 '18 at 18:10
DimaDima
25.1k32236
answer will hold only if it has only two keys!! but the idea is right i have updated my answer thank you!!
– Raman Mishra
Nov 14 '18 at 18:40
Well, yeah ... that's what he said:my collection looks like this: [fileName, 'someVal'] [Directory, 'someVal']So ... two keys.
– Dima
Nov 14 '18 at 19:59
add a comment |
1
If you have something like val args = Map("filename" -> "data.json", "directory" -> "temp"),
then s"${args("directory")}/data/${args("filename")}" will evaluate to "/temp/data/data.json"
answered Nov 14 '18 at 18:10
DimaDima
25.1k32236
answer will hold only if it has only two keys!! but the idea is right i have updated my answer thank you!!
– Raman Mishra
Nov 14 '18 at 18:40
Well, yeah ... that's what he said:my collection looks like this: [fileName, 'someVal'] [Directory, 'someVal']So ... two keys.
– Dima
Nov 14 '18 at 19:59
add a comment |
1
1
1
If you have something like val args = Map("filename" -> "data.json", "directory" -> "temp"),
then s"${args("directory")}/data/${args("filename")}" will evaluate to "/temp/data/data.json"
answered Nov 14 '18 at 18:10
DimaDima
25.1k32236
If you have something like val args = Map("filename" -> "data.json", "directory" -> "temp"),
then s"${args("directory")}/data/${args("filename")}" will evaluate to "/temp/data/data.json"
answered Nov 14 '18 at 18:10
DimaDima
25.1k32236
answered Nov 14 '18 at 18:10
DimaDima
25.1k32236
answered Nov 14 '18 at 18:10
DimaDima
25.1k32236
answered Nov 14 '18 at 18:10
DimaDima
25.1k32236
25.1k32236
answer will hold only if it has only two keys!! but the idea is right i have updated my answer thank you!!
– Raman Mishra
Nov 14 '18 at 18:40
Well, yeah ... that's what he said:my collection looks like this: [fileName, 'someVal'] [Directory, 'someVal']So ... two keys.
– Dima
Nov 14 '18 at 19:59
add a comment |
answer will hold only if it has only two keys!! but the idea is right i have updated my answer thank you!!
– Raman Mishra
Nov 14 '18 at 18:40
Well, yeah ... that's what he said:my collection looks like this: [fileName, 'someVal'] [Directory, 'someVal']So ... two keys.
– Dima
Nov 14 '18 at 19:59
answer will hold only if it has only two keys!! but the idea is right i have updated my answer thank you!!
– Raman Mishra
Nov 14 '18 at 18:40
answer will hold only if it has only two keys!! but the idea is right i have updated my answer thank you!!
– Raman Mishra
Nov 14 '18 at 18:40
Well, yeah ... that's what he said:
my collection looks like this: [fileName, 'someVal'] [Directory, 'someVal'] So ... two keys.– Dima
Nov 14 '18 at 19:59
Well, yeah ... that's what he said:
my collection looks like this: [fileName, 'someVal'] [Directory, 'someVal'] So ... two keys.– Dima
Nov 14 '18 at 19:59
add a comment |
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use it like this s"${directory}/data/${fileName}" it should work
– Raman Mishra
Nov 14 '18 at 17:33
and the map should be like Map[String, List[String]] as value can me more than one file in a directory?
– Raman Mishra
Nov 14 '18 at 17:35
my interpolated (to be) values come as a Map Collection and for the interpolation pattern that you have offered you need declared vars in the scope of the s (sugar function)
– Rio Amarillo
Nov 14 '18 at 17:37
it's not necessary that you declare a var you can use ListBuffer
– Raman Mishra
Nov 14 '18 at 17:39
example por favor
– Rio Amarillo
Nov 14 '18 at 17:39