Scala Map Get

Scala Map Get. Scala Map Scaler Topics Scala Map get()方法示例 在Scala中，Map是一种非常常见的数据结构。如果我们想获取Map中某个键对应的值，可以使用get()方法。本文将演示如何使用Scala的Map get()方法来获取Map中指定键对应的值。 阅读更多：Scala 教程 1 For these examples we won't break the Map methods down into individual sections; we'll just provide a brief comment before each method.

In these initial examples we'll use an immutable Map, and Scala also has a mutable Map class that you can modify in place, and it's demonstrated a little later in this lesson. The operation "m get key" tests whether the map contains an association for the given key

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These turn maps into partial functions from keys to values The operation "m get key" tests whether the map contains an association for the given key In order to get all the values from a Scala map, we need to use values method (to get all the values as an Iterable) and if we want to get the values as an iterator, we need to use valuesIterator method

Scala Logo I Logo of Scala programming language in origami… Flickr. The apply method on the Map can be used to retrieve the value without the Option wrapper, throwing an exception if the key does not exist val map = Map(1 -> 2) map(1) // 2 map(2) // NoSuchElementException def apply(key: K): V Retrieves the value which is associated with the given key.

Scala Map Scaler Topics. In order to get all the values from a Scala map, we need to use values method (to get all the values as an Iterable) and if we want to get the values as an iterator, we need to use valuesIterator method The fundamental lookup method for a map is: def get(key): Option[Value]