Removing elements with same value from NSMutableArray - objective-c

Question

My NSMutableArray contains some strings as elements. One of the element is repeated many times at different indexes in the array. For example [#"", #"1,2,3",#"",#"5,3,2,1",#""].
I want to remove all the elements with value #"" from the mutable array. I tried following ways but couldn't get the solution.
Using For loop:
for(id obj in myMutableArray)
{
if([obj isEqualToString:#""])
{
[myMytableArray removeObject:obj];
}
}
Using dummy mutable array called nextMutableArray
for(id obj in myMutableArray)
{
if([obj isEqualToString:#""])
{
continue;
}
else [nextMutableArray addObject:obj];
}
In both the ways, elements (#"") at other indexes are removed but not at the index 0 (first object). What could be the possible reason? Is there any way to remove all the elements that contain string #"" from the mutable array?

Answer 1

one option is to filter your array using predicates:
NSArray *someArray = #[#"", #"1,2,3", #"", #"5,3,2,1", #""];
NSLog(#"%#", someArray);
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"SELF != ''"];
NSArray *filteredArray = [someArray filteredArrayUsingPredicate:predicate];
NSLog(#"%#", filteredArray);

Answer 2

No Need of For loop. Simply use this.
[mutableArray removeObjectIdenticalTo:#""];

Answer 3

If you want to remove duplicate entries from an array, You can use NSSet Class.
NSSet did not accept duplicate/s value.
NSMutableArray *arrTest=[[NSMutableArray alloc]initWithObjects:#"", #"1,2,3",#"",#"5,3,2,1",#"", nil];
NSSet *set = [NSSet setWithArray:arrTest];
arrTest = [[set allObjects] mutableCopy];
or
You can do like this:
NSPredicate *predicate = [NSPredicate predicateWithBlock:^BOOL(id str, NSDictionary *unused) { return ![str isEqualToString:#""]; }];
arrTest = [[arrTest filteredArrayUsingPredicate:predicate]mutableCopy];
This is fast and simple way.