复制// 1.用指定的方法排序,可变数组排序 NSMutableArray *arr1 = [NSMutableArray arrayWithObjects:@"sunday", @"sunny", @"summer", @"sun", nil]; // 原数组的顺序改变,指定元素的比较方法:compare:,默认排序方式为升序排列 [arr1 sortUsingSelector:@selector(compare:)]; // 使排序结果 降序 排列 ...
init(unsafeUninitializedCapacity: Int, initializingWith: (inout UnsafeMutableBufferPointer<Element>, inout Int) throws -> Void) rethrows Creates an array with the specified capacity, then calls the given closure with a buffer covering the array’s uninitialized memory. Inspecting an Array var isEmpty...
)*///更新元素[mutableArray replaceObjectAtIndex:(NSInteger)5withObject:@"replacedItem"]; NSLog(@"%@",mutableArray);/*( item0, "inserted item", item1, item2, item3, replacedItem )*///删除所有元素[mutableArray removeAllObjects]; NSLog(@"%ld",mutableArray.count);/*0*/} NSDictionary 字典...
This value must not exceed the bounds of the array. Returns: the Object or null. getString @Nullable public String getString(int index) Gets value at the given index as a String. Returns null if the value doesn't exist, or its value is not a String. Parameters: index - the index. ...
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") ...
95. Is array mutable in Scala? Yes No Answer:B) No Explanation: To create a mutable array in Scala arrayBuffer is used. Learn & Test Your Skills Python MCQsJava MCQsC++ MCQsC MCQsJavaScript MCQsCSS MCQsjQuery MCQsPHP MCQsASP.Net MCQs ...
The array associated with the specified key, ornilif the key does not exist or its value is not an array. Discussion The returned array and its contents are immutable, even if the values you originally set were mutable. See Also Related Documentation ...
Manipulate Arrays as Mutable SequencesAlthough the array class is fairly low level and used rather infrequently in Python, it’s a full-fledged sequence type alongside the more widespread list and tuple data types. As a result, you can use an array whenever a sequence or an iterable is ...
IsDefaultOrEmpty Gets a value indicating whether this ImmutableArray<T> is empty or is not initialized. IsEmpty Gets a value indicating whether this ImmutableArray<T> is empty. Item[Int32] Gets the element at the specified index in the immutable array. Length Gets the number of elements in...
1.NSMutableArray初始化 - (instancetype)initWithCapacity:(NSUInteger)numItems NS_DESIGNATED_INITIALIZER; + (instancetype)arrayWithCapacity:(NSUInteger)numItems; 2.NSMutableArray增、删、替换、交换、重置操作 (1)元素的增加 -(void)addObject:(ObjectType)anObject; -(void)addObjectsFromArray:(NSArray<Object...