I am trying to loop over a map in scala template in playFramework2.2. Here is the code for that:
<ol>
@for(((key, value), currentIndex) <- m.myMap.zipWithIndex) {
<li>@key - @value - @currentIndex</li>
}
</ol>
map declaration in java:
Map myMap = new HashMap<String, Integer>();
map declaration in scala:
meters: List[intranet.controllers.Index.Meter]
And I've sorted that map (by value) already with java method as follow:
public static Map sort(Map unsortMap, Order order) {
List list = new LinkedList(unsortMap.entrySet());
comparator = new Comparator() {
public int compare(Object o1, Object o2) {
return ((Comparable) ((Map.Entry) (o1)).getValue()).compareTo(((Map.Entry) (o2)).getValue());
}
}
Collections.sort(list, comparator);
Map sortedMap = new LinkedHashMap();
for (Iterator it = list.iterator(); it.hasNext();) {
Map.Entry entry = (Map.Entry) it.next();
sortedMap.put(entry.getKey(), entry.getValue());
}
return sortedMap;
}
Unfortunately my problem is that I iterate over a map with zipWithIndex
method I loose my order.
Here is current result:
Key - Value - Index
WA - 41 - 4
BA - 66 - 0
BM - 52 - 2
DP - 0 - 6
JTM - 0 - 7
TN - 59 - 1
WP - 46 - 3
SM - 0 - 5
As You can see it is not ordered, but it should be that way:
Key - Value - Index
BA - 66 - 0
TN - 59 - 1
BM - 52 - 2
WP - 46 - 3
WA - 41 - 4
SM - 0 - 5
DP - 0 - 6
JTM - 0 - 7
So question are:
I figure out first question. Here is working loop code:
@for(((key, value), currentIndex) <- m.lastMonthRanking.view.zipWithIndex) {
<li>
<span @if(session().get("email").equals(key)){ class="label label-info" style="font-size: 100%; display: grid"}>@key
<span class="badge">@value</span>
</span>
</li>
}
Edit
I have a map, where key is @userName
(String) and @value
is (Integer).
I wanna print list <ol><li>@userName (@value)</li></ol>
ordered by @value
. If value is repeated in many users I would like to print those element in other way, so I have to know is next/previous element in the list has the same value. Normally in java with list I would do something like that:
for (int i = 0; i < CrunchifyList.size(); i++) {
System.out.println(CrunchifyList.get(i-1) + " is previous element");
System.out.println(CrunchifyList.get(i) + " is current element");
System.out.println(CrunchifyList.get(i+1) + " is next element");
}
But now I need to do this in scala and with map. Please help
As for first question, you should use a map that maintains the insertion order. One example is the scala.collection.immutable.ListMap
.
@ import scala.collection.immutable.{HashMap, ListMap}
import scala.collection.immutable.{HashMap, ListMap}
@ val l = 1 to 5
l: collection.immutable.Range.Inclusive = Range(1, 2, 3, 4, 5)
@ val hm = HashMap(l.zipWithIndex: _*)
hm: HashMap[Int, Int] = Map(5 -> 4, 1 -> 0, 2 -> 1, 3 -> 2, 4 -> 3)
@ val lm = ListMap(l.zipWithIndex: _*)
lm: ListMap[Int, Int] = Map(1 -> 0, 2 -> 1, 3 -> 2, 4 -> 3, 5 -> 4)