Is Scala mutable map thread-safe?

To get a thread-safe mutable map, you can mix the SynchronizedMap trait trait into whatever particular map implementation you desire.

Is Scala list thread-safe?

Note: Despite being an immutable collection, the implementation uses mutable state internally during construction. These state changes are invisible in single-threaded code but can lead to race conditions in some multi-threaded scenarios.

Is Scala vector thread-safe?

P.S. Scala had several unexpected issues with synchronization, which caused some parts of the library to be surprisely not thread-safe, so I wouldn’t wonder if something may be wrong (and this is a bug then), but in let’s say 99\% cases for 99\% methods immutable collections are thread safe.

Are collections thread-safe?

All collection classes (except Vector and Hashtable) in the java. util package are not thread-safe. The only two legacy collections are thread-safe: Vector and Hashtable.

What is TrieMap in Scala?

A Scala TrieMap is a trie-based concurrent scalable map implementation. Unlike normal trie maps, a Scala TrieMap has an efficient, non-blocking, O(1) time snapshot operation (and a slightly optimized readOnlySnapshot ) operation.

Which feature is synthetically generated for case classes?

Tuple22. In addition, all case classes implement Product with synthetically generated methods. As we will see below, Product trait adds helpful methods to our Case classes like getting size(number of arguments) or accessing argument values via index positions.

How do you prove a HashMap is not thread-safe?

Resizing and rehashing operation executed under certain conditions most commonly if exceed bucket threshold. This code proves that if I call resizing externally or If I put more element than threshold and tend to call resizing operation internally causes to some null read which shows that HashMap is not thread safe.

Is linked list thread-safe?

No, LinkedList is not thread safe or by default it is not synchronized in java. LinkedList implements the List and Deque interfaces to have a doubly LinkedList implementation.

How can collections be thread-safe?

A thread-safe variant of ArrayList in which all mutative operations (e.g., add, set, remove..) are implemented by creating a separate copy of an underlying array. It achieves thread safety by creating a separate copy of the List which is different than vector or other collections used to provide thread-safety.

Is Scala TrieMap thread safe?

A concurrent hash-trie or TrieMap is a concurrent thread-safe lock-free implementation of a hash array mapped trie. It has particularly scalable concurrent insert and remove operations and is memory-efficient.

Is Scala case class immutable?

A Scala Case Class is like a regular class, except it is good for modeling immutable data. A scala case class also has all vals, which means they are immutable.

How do you know if a Scala collection is immutable?

A collection in package scala.collection.immutable is guaranteed to be immutable for everyone. Such a collection will never change after it is created. Therefore, you can rely on the fact that accessing the same collection value repeatedly at different points in time will always yield a collection with the same elements.

Where can I find the collection classes in Scala?

All collection classes are found in the package scala.collection or one of its sub-packages mutable, immutable, and generic. Most collection classes needed by client code exist in three variants, which are located in packages scala.collection , scala.collection.immutable, and scala.collection.mutable , respectively.

What is the difference between mutable and immutable collections?

A mutable collection can be updated or extended in place. This means you can change, add, or remove elements of a collection as a side effect. Immutable collections, by contrast, never change.

How do I get the mutable default version of a collection?

To get the mutable default versions, you need to write explicitly collection.mutable.Set, or collection.mutable.Iterable. A useful convention if you want to use both mutable and immutable versions of collections is to import just the package collection.mutable.