Merge the same objects inside array IOS - ios

Question

I have an array which contains this objects:
(
{
aOptns = (
);
fCustomDscnt = 0;
fPrcntDscnt = 0;
fPrice = 0;
fQty = 1;
iItemDayPriceId = 143;
iShiftId = 1;
sItemName = "";
sModifier = "";
},
{
aOptns = (
);
fCustomDscnt = 0;
fPrcntDscnt = 0;
fPrice = 0;
fQty = 1;
iItemDayPriceId = 143;
iShiftId = 1;
sItemName = "";
sModifier = "";
},
{
aOptns = (
);
fCustomDscnt = 0;
fPrcntDscnt = 0;
fPrice = 0;
fQty = 1;
iItemDayPriceId = 143;
iShiftId = 1;
sItemName = "";
sModifier = "";
},
{
aOptns = (
);
fCustomDscnt = 0;
fPrcntDscnt = 0;
fPrice = 0;
fQty = 1;
iItemDayPriceId = 112;
iShiftId = 1;
sItemName = "";
sModifier = "";
}
)
I need to merge the contents of array if the objects are same and modify the object inside that array in such a way that it should be like this:
(
{
aOptns = (
);
fCustomDscnt = 0;
fPrcntDscnt = 0;
fPrice = 0;
fQty = 3;
iItemDayPriceId = 143;
iShiftId = 1;
sItemName = "";
sModifier = "";
},
{
aOptns = (
);
fCustomDscnt = 0;
fPrcntDscnt = 0;
fPrice = 0;
fQty = 1;
iItemDayPriceId = 112;
iShiftId = 1;
sItemName = "";
sModifier = "";
}
)
As you can see, the entry for object with iItemDayPriceId = 143 becomes 1 only with fQty = 3.
I have tried using the code here: How to Find Duplicate Values in Arrays?
But it is only comparing 2 objects at a time.

Answer 1

Edit: Oops, I missed your count requirement.
Edit 2: And the fact that you wanted to mutate the given array rather the build a new one.
Depends on what you mean by distinct but since it looks like you mean to compare the contents and not the references, you should build a new array so that if the comparison is true you increment the count and otherwise you add the object.
Mutate existing array
Disclaimer: probably not my best work here.
I would appreciate if someone could suggest how to improve this because I am pretty sure it is not the best way to do this and may not even work (don't have access to an Obj-C compiler at the moment).
Foo objectA = [Foo new];
objectA.Bar = #"Bar";
Foo objectB = [Foo new];
objectB.Bar = #"Bar";
Foo objectC = [Foo new];
objectC.Bar = #"Not Bar";
NSMutableArray *array = #[objectA, objectB, objectC];
NSMutableDictionary *countDictionary = [[NSMutableDictionary alloc] init];
for (Foo *foo in [array copy])
{
bool found = false;
for (Foo *key in countDictionary)
{
if ([key isEqualTo:foo])
{
NSNumber *currentCount = [countDictionary objectForKey:key];
int currentIntCount = [currentCount intValue];
currentIntCount++;
[countDictionary setObject:[NSNumber numberWithInt:currentIntCount] forKey:key];
[array removeObject:key];
found = true;
break;
}
if (!found)
[countDictionary setObject:[NSNumber numberWithInt:1] forKey:foo];
}
}
for (Foo *realFoo in array)
{
NSNumber *countNumber = [countDictionary objectForKey:realFoo];
int countInt = [countNumber intValue];
realFoo.Count = countInt;
}
Build new array
Foo objectA = [Foo new];
objectA.Bar = #"Bar";
Foo objectB = [Foo new];
objectB.Bar = #"Bar";
NSMutableArray *array = #[objectA, objectB];
NSMutableArray *distinct = [[NSMutableArray alloc] init];
for (Foo *f in array)
{
bool found = false;
for (Foo *d in distinct)
{
if ([d isEqualTo:f])
{
found = true;
d.Count++;
}
break;
}
if (!found)
[distinct addObject:f];
}
And of course you would have to define an equality comparer for Foos, in this case for instance
-(bool) isEqualTo:(Foo *)nFoo
{
bool isEqual = false;
if ([self.Bar isEqualToString:nFoo.Bar])
isEqual = true;
return isEqual;
}
Having not dealt with Objective C in a while I should say that there may be some best-practices as to implementing equality comparison instead of rolling your own completely like this example

Answer 2

Use below code:
NSMutableArray* myArray =
[[NSMutableArray alloc]initWithObjects:
#"red",#"blue",#"red",#"green",#"yellow", #"33", #"33",#"red", #"123", #"123",nil];
NSOrderedSet *mySet = [[NSOrderedSet alloc] initWithArray:myArray];
myArray = [[NSMutableArray alloc] initWithArray:[mySet array]];
NSLog(#"%#",myArray);