NSMutableArray基础-创建、添加、删除、替换

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
@autoreleasepool {
//创建并设定数组元素个数
NSMutableArray *arr1=[NSMutableArray arrayWithCapacity:7];
//复制数组
NSArray *arr2=@[@"mon",@"tue",@"wed",@"thu",@"fri",@"sat",@"sun"];
NSMutableArray *arr3=[NSMutableArray arrayWithArray:arr2];
//向数组中添加一个元素
[arr3 addObject:@"eig"];
//根据指定下标插入元素
[arr3 insertObject:@"nin" atIndex:8];
//删除最后一个元素
[arr3 removeLastObject];
//根据指定下标删除元素
[arr3 removeObjectAtIndex:7];
//根据指定对象删除元素（若未找到返回NSNotfind
[arr3 removeObject:@"sun"];
//替换指定下标的元素
[arr3 replaceObjectAtIndex:0 withObject:@"one"];
//删除全部元素
[arr3 removeAllObjects];
}
return 0;
}