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I have a scala multimap which looks like this

Key: fish value: Set:(salmon,batam fish, shark)
Key: winged animals value: Set:(chicken, ducks)

I have a string text which looks like this:

val string = "the market had sold salmon and chicken"

As the string contains salmon and chicken, i need to return back the keys fish and winged animals.

Is there a way to iterate through the value sets and return a key if there is a match? I can loop through key value pairs but i can only get the multimap as shown above and not the individual values.


val index: Map[String, Set[String]] = Map(
  "Fish" -> Set("salmon", "batam", "shark"),
  "Winged Animals" -> Set("chicken", "ducks"),
  "Other" -> Set("cow", "pig")

def typesInString(search: String): Set[String] = index.filter {
  case (t, vals) =>

typesInString("the market had sold salmon and chicken")
// Set(Fish, Winged Animals)

loop through arraylist in the Multimap (Java in General forum at , I have a Multimap which stores string,integer and list as a value to the keys. Below is code that I tried. But the problem is I want to get the values  Given a multimap and a key of the multimap, our task is to simply display the (key – value) pairs of the given key. In multimap we can have multiple (key – value) pair for the same key. Suppose our multimap contains. key value 1 10 2 20 2 30 2 40 3 50 4 60 4 70 key : 2 key value 2 20 2 30 2 40.

One approach would be to create a reverse Map from the MultiMap for value-key lookup, as below:

import collection.mutable.{ Set, HashMap, MultiMap }

val text = "the market had sold salmon and chicken"

val mm = new HashMap[String, Set[String]] with MultiMap[String, String]

mm.addBinding("fish", "salmon")
mm.addBinding("fish", "batam fish")
mm.addBinding("fish", "shark")
mm.addBinding("winged animals", "chicken")
mm.addBinding("winged animals", "ducks")

val reverseList = for {
  mList <- mm.toList
  mValue <- mList._2
yield (mValue, mList._1)

// Use groupBy instead of toMap (*)
val reverseMap = reverseList.groupBy(_._1).mapValues(_.map(_._2))
// reverseMap: scala.collection.immutable.Map[String,List[String]] = Map(
//   salmon -> List(fish), ducks -> List(winged animals), chicken -> List(winged animals),
//   shark -> List(fish), batam fish -> List(fish)
// )

  case x if reverseMap.contains(x) => reverseMap(x)
// res1: Array[List[String]] = Array(List(fish), List(winged animals))

(*) Note that groupBy, instead of toMap, is applied to reverseList to allow an animal belonging to multiple groups; which is also why the result is a nested collection (e.g. a bat could belong to List(mammals, winged animals)).

Iterate through Multimap by compare (Beginning Java forum at , Iterate through Multimap by compare Is the value a String[] type or an Object[] type or is it something else ( toString can print values like an  While iterating over a std::map or a std::multimap, the use of auto is preferred to avoid useless implicit conversions (see this SO answer for more details). PDF - Download C++ for free

Without looping through key-value pairs, using only own MultiMap methods, we still have to loop through the keys:

val items: MultiMap[String, String] = ...

val string = "the market had sold salmon and chicken"

val matched = items.keys.filter(key => items.entryExists(key, string.contains(_)))

// Set(winged animals, fish)

How to traverse through all values for a given key in multimap , In multimap we can have multiple (key – value) pair for the same key. Method 1 (Simple Traversal) Traverse through whole map and whenever the key is upper_bound(key) : returns the iterator pointing to the first element which is greater  There are 3 pairs with duplicate key ‘c’. Values associated with key ‘c’ are 3,5 & 6. Now let’s see how to access all the values associated with a key in multimap. std::multimap::equal_range. We can find all values of a key in Multimap using is member function equal_range().

Google Guava's Multimap Class in Java, Iterate over the Multimap. Guava's Multimap provides keySet(), entries(), values(), keys() methods which are similar to the corresponding view collections of Map. Return Value. An iterator to the first element in the container. If the multimap object is const-qualified, the function returns a const_iterator. Otherwise, it returns an iterator. Member types iterator and const_iterator are bidirectional iterator types pointing to elements (of type value_type).

com.google.common.collect.Multimap.forEach java code examples , Best Java code snippets using com.google.common.collect.Multimap.forEach HashMultimap.create(); ImmutableMultimap.of(); Smart code suggestions by Codota. } Performs the given action for all key-value pairs contained in this multimap. To loop over all keys and their associated value collections, write Multimaps. In this article we will discuss the different ways to iterate over an unordered_map. First lets create an unordered_map and then we will see the different ways to iterate over it. If you didn't find what you were looking, then do suggest us in the comments below. We will be more than happy to add that.

Guava Multimap, Here are some of the advantages a multimap has over, for example, Map<X, You can iterate through all values without first obtaining the list associated with  Varun October 1, 2016 multimap Example and Tutorial in C++ 2016-10-02T13:24:04+05:30. In this article we will discuss the MultiMap in C++. Multi-map in C++ is an associative container like map. It internally store elements in key value pair. But unlike map which store only unique keys, multimap can have duplicate keys.