Nsarray and variable array nsmutablearray differences and usages of non-variable groups

Nsarray and variable array nsmutablearray differences and usages of non-variable groups

The following is a related code implementation:

#import <Foundation/Foundation.h>

#import "Person.h"

/*

Nsarray: Non-variable group


Nsmutablearray: Variable Array
*/


int main ()
{
@[] Create only immutable groups Nsarray
/* Wrong wording
Nsmutablearray *array = @[@ "Jack" @ "Rose"];

[Array addobject:@ "Jim"];
*/


Nsarray *array = @[@ "Jack" @ "Rose"];

return 0;
}


Basic use of variable groups
void Use3 ()
{
Nsmutablearray *array = [Nsmutablearray arraywithobjects:@ "Rose", @ "Jim", Nil];

adding elements
[Array Addobject:[[person alloc] init];

[Array addobject:@ "Jack"];

Delete Element
[Array removeallobjects];
Deletes the specified object
[Array removeobject:@ "Jack"];
[Array removeobjectatindex:0];

Wrong wording
[Array Addobject:nil];


NSLog (@ "%@", array);

NSLog (@ "%ld", Array.count);
}


Iterating through an array
void Use2 ()
{
Person *p = [[Person alloc] init];

Nsarray *array = @[p, @ "Rose", @ "Jack"];

for (int i = 0; i<array.count; i++)
//    {
NSLog (@ "%@", Array[i]);
//    }

ID obj represents each element in an array
int i = 0;
for (ID obj in array)
//    {
Find the position of the obj element in the array
Nsuinteger i = [array indexofobject:obj];
//
NSLog (@ "%ld-%@", I, obj);
i++;
//
if (i==1)
//        {
Break
//        }
//    }

[Array Enumerateobjectsusingblock:

Each time you traverse to an element, the block is called
and the current element and index position are passed as parameters to block
^ (ID obj, Nsuinteger idx, BOOL *stop)
{
NSLog (@ "%ld-%@", idx, obj);


if (idx = = 0)
{
Stop traversal
*stop = YES;
}

}];


void ^ (Myblock) (ID, Nsuinteger, bool *) = ^ (Id obj, Nsuinteger idx, BOOL *stop)
//    {
NSLog (@ "%ld-%@", idx, obj);
//
//
if (idx = = 0)
//        {
Stop traversal
*stop = YES;
//        }
//    };
//
for (int i = 0; i<array.count; i++)
//    {
Used to mark whether or not to stop traversal
BOOL isstop = NO;
//
remove element
ID obj = Array[i];
//
Myblock (obj, I, &isstop);
//
//
if (isstop)
//        {
Break
//        }
//    }


}


void use ()
{
/*
int a = 5;

int ages[10] = {1, 90, 89, 17};

Person *p = [[Person alloc] init];
Person *persons[5] = {p, [[Person alloc] init]};
*/

OC Array cannot hold nil value
OC arrays can only hold OC objects, cannot hold non-OC object types, such as int, struct, enum, etc.

This array is always an empty array
Nsarray *array = [Nsarray array];


/*
Creation of 1.NSArray
*/
Nsarray *array2 = [Nsarray arraywithobject:@ "Jack"];

Nil is the tag at the end of the array element
Nsarray *array3 = [Nsarray arraywithobjects:@ "Jack" @ "Rose", nil];
[Array2 Count];

Nsarray *array4 = [Nsarray arraywithobjects:@ "Jack", @ "Rose", @ "4324324", nil];

Quickly create a Nsarray object
Nsarray *array4 = @[@ "Jack" @ "Rose" @ "4324324"];


/*
Number of elements in 2.NSArray
*/
NSLog (@ "%ld", Array3.count);


/*
Access to elements in 3.NSArray
*/
NSLog (@ "%@", [Array3 objectatindex:1]);

ARRAY3[1];
NSLog (@ "%@", array3[0]);
}

Nsarray and variable array nsmutablearray differences and usages of non-variable groups