NSLog(@"self.dataArray count is:%d",[self.dataArray count]); NSLog(@"self.dataArray index 2 is:%@",[self.dataArray objectAtIndex:2]); ---从一个数组拷贝数据到另一数组(可变数级)--- //arrayWithArray: NSArray *array1 = [[NSArray alloc] init]; NSMutableArray *MutableArray = [[N...
在Scala中,把哈希表这种数据结构叫做映射 1. 构建映射 2. 获取和修改映射中的值 好用的getOrElse 注意:在Scala中,有两种Map,一个是immutable包下的Map,该Map中的内容不可变;另一个是mutable包下的Map,该Map中的内容可变 例子: 注意:通常我们在创建一个集合是会用val这个... ...
Using add() Mutable O(n) Manual iteration required, flexible Arrays.asList() Immutable O(1) Fixed-size list, backed by the original array Collections.addAll() Mutable O(n) Efficient for adding elements Java 8 Streams Mutable O(n) Functional approach, concise Mahesh...
The function expects a pointer to an array of signed integers as well as the length of the array. The second argument is necessary because C doesn’t keep track of the number of elements in arrays. Then, the function loops over array indices and increments each element by one....
def +: | :+ :a+:b or a:+b 在数组内加入一个常量元素,靠近:的为常量 val a=Array(1,2,3)3+:a//Array[Int] = Array(3, 1, 2, 3) def /: | :\ :n:Int /: Array[T] 返回Array[T] 对数组所有元素进行相同操作,foldLeft(左二叉树) | foldRight(右二叉树)简写 ...
A JSON array (an ordered sequence of zero or more values). The object may contain any subtype ofOracleJsonValuewhich includes the extended SQL types such asOracleJsonTimestamp. Instances ofOracleJsonArraymay either be mutable or immutable. When an instance is immutable, calling methods that would...
Array is mutable, but fixed length. Which means you can modify items in the Array, but you cannot add / remove item; //Array is fixed length, you cannot add or remove itemval ary: Array<String> = arrayOf("Wan", "Zhen", "Tian") ...
Arrays in Scala are generally immutable, so we need to create a new array that will store the concatenated array in Scala. Or another method could be creating mutable arrays that will save memory. For merging two arrays Scala provides you multiple methods and we will discuss them one by one...
copy 与 mutableCopy (1) 方法简介 拷贝方法 : -- copy 方法 : 复制对象的副本, 一般返回对象可修改的副本;假如被复制的对象是可修改 NSMutableString, 复制后成为NSString 不可修改; -- mutable 复制对象的可变副本, 返回对象的可变副本; 假如被复制对象不可修改 如 NSString, 使用...
* This library is free software; you can redistribute it and/or @@ -116,7 +116,7 @@ object CalibrateTask { private def showScatterChart(x: IndexedSeq[IndexedSeq[Double]], y: IndexedSeq[IndexedSeq[Double]], seriesLabels: Array[String], seriesLabels: IndexedSeq[String], chartTitle: Strin...