you can no longer add or remove any elemetns. You can, however, change the values of elements in the array. This is in contrast to a vector array, which is a mutable array, in which elements can be added or removed
newArray = (NSMutableArray*)CFPropertyListCreateDeepCopy(kCFAllocatorDefault, (CFPropertyListRef)oldArray, kCFPropertyListMutableContainers); NSLog(@"newArray:%@", newArray); ===NSMutableArray===(可变数组) Mutable version of NSArray. - (void)addObject:(id)anObject; // 在array最后添加anObjec...
For read-only operations, bytes objects would be faster, but bytearray provides the best balance when mutability is required. Best Practices Use for mutable data:When you need to modify binary data after creation Prefer bytes for constants:Immutable data should use bytes objects Specify encodings:A...
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...
NSArray和NSMutableArray—数组,包含有序的对象集。通过在数组中指定对象的位置(即索引)来访问对象。数组中首个元素的索引是 0(零)。 NSSet和NSMutableSet—集合,储存无序的对象集,其中每个对象仅出现一次。一般是将测试或过滤器应用到集合中的对象,来访问这些集合中的对象。
When the destination array’s element type is a class or an @objc protocol, bridging from NSArray to Array first calls the copy(with:) (- copyWithZone: in Objective-C) method on the array to get an immutable copy and then performs additional Swift bookkeeping work that takes O(1) tim...
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....
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...
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...
### tuple is immutable,无法删减元素 ### ### tuple 加减乘除 ### x_double = x_tpl * 2 # x_double = (1,2,4,6,1,2,4,6) x_plus_y = x_tpl + y_tpl # x_plus_y = (1, 2, 4, 6, 1, 3, 6, 9) print(min(x_tpl),max(x_tlp),sum(x_tpl)) # 最大、最小、求和 ...