Are Set Iterators Mutable or Immutable?Klaus Kreft
比如api接口返回一个set,不期望调用方不小心去修改了返回结果,破坏结果集,这个时候immutable就派上用场了。另外immutable在多线程并发的时候比较提倡,这样可以减少错误率。至于mutable的,函数式编程里头不建议用。 有用 回复 撰写回答 你尚未登录,登录后可以 和开发者交流问题的细节 关注并接收问题和回答的更新提醒 ...
kotlin的集合分为可变集合类Mutable和不可变集合类Immutable,List、Set、Map都是不可变集合,与之对应MutableList、MutableSet、MutableMap是可变集合 创建集合 使用listOf()、setOf()、mapOf() 创建不可变的 List、Set、Map 使用mutableListOf()、mutableSetOf()、mutableMap() 创建可变的 MutableList 、MutableSet 、...
在scala中,默认使用的都是immutable集合,如果要使用mutable集合,需要在程序中引入 import scala.collection.mutable //由于immutable是默认导入的,因此要使用mutable中的集合的话 //使用如下语句 scala> val mutableSet=mutable.Set(1,2,3) mutableSet: scala.collection.mutable.Set[Int] = Set(1, 2, 3) //不...
Map#asMutable OrderedSet#asImmutable() 代码语言:javascript 复制 asImmutable(): Set<T> Inherited from Set#asImmutable see Map#asImmutable Conversion to Seq OrderedSet#toSeq() 返回Seq.Set。 代码语言:javascript 复制 toSeq(): Seq.Set<T> Inherited from Collection.Set#toSeq OrderedSet#toKeyedSeq...
following types: Bool, Int, Int8, Int16, Int32, Int64, Float, Double, String, Data, Date, Decimal128, and ObjectId (and their optional versions) Unlike Swift’s native collections, MutableSets are reference types, and are only immutable if the Realm that manages them is opened as read...
* @param g an immutable graph. */ public SetMutableGraph( final ImmutableGraph g ) { successors = new IntAVLTreeSet[ 0 ]; int d, s = -1; long numArcs = 0; for( NodeIterator nodeIterator = g.nodeIterator(); nodeIterator.hasNext(); ) { ...
Creates an immutable hash set that has the same contents as this set and can be efficiently mutated across multiple operations by using standard mutable interfaces. ToString() Returns a string that represents the current object. (Inherited from Object) TryGetValue(T, T) Searches the set for...
expect(Map<number, number>().withMutations(mutable => mutable)).type.toBe< Map<number, number>22 changes: 21 additions & 1 deletion 22 type-definitions/ts-tests/set.ts Original file line numberDiff line numberDiff line change @@ -1,5 +1,5 @@ ...
This post will discuss various methods to create an immutable set in Java. Immutable Sets have many advantages over their mutable siblings, like they are thread-safe, more memory-efficient, and can be passed to untrusted libraries without any side effect