How to compare two nsarrays with different values? - ios

Question

Hi i have two nsarrays.
Array A:
arrProductSelection = [[NSArray alloc]initWithObjects:#"English",#"German",#"Russian",#"Chinese",#"Spanish",#"French",#"French",#"French",#"French",#"French",#"French",#"French",#"French",nil];
Array B:
arrProductSelectionB = [[NSArray alloc]initWithObjects:#"deselcted",#"selected",#"selected",#"selected",#"deselcted",#"deselcted",#"deselcted",#"deselcted",#"deselcted",#"deselcted",#"deselcted",#"deselcted",#"deselcted",nil];
I need to compare two arrays and get the value from array A by comparing with array B having value as selected. That is i should get german,chinese and russian sepearted by comma as nsstring.

Answer 1

Try this:
NSMutableArray *arrSelected = [[NSMutableArray alloc] init];
NSArray *arrProductSelection = [[NSArray alloc]initWithObjects:#"English",#"German",#"Russian",#"Chinese",#"Spanish",#"French",#"French",#"French",#"French",#"French",#"French",#"French",#"French",nil];
NSArray *arrProductSelectionB = [[NSArray alloc]initWithObjects:#"deselcted",#"selected",#"selected",#"selected",#"deselcted",#"deselcted",#"deselcted",#"deselcted",#"deselcted",#"deselcted",#"deselcted",#"deselcted",#"deselcted",nil];
for(int i = 0; i< arrProductSelectionB.count-1;i ++) {
if ([arrProductSelectionB[i] isEqualToString:#"selected"]) {
[arrSelected addObject:arrProductSelection[i]];
}
}
NSString *strSelected = [arrSelected componentsJoinedByString:#","];
NSLog(#"%#", strSelected);//output: German,Russian,Chinese

Answer 2

If you can make this type of array then manage easly.
(
{
flag = deselcted;
name = English;
},
{
flag = selected;
name = German;
},
{
flag = deselcted;
name = Russian;
},
{
flag = deselcted;
name = Chinese;
}
)
==> Array[(dictionary),(dictionary),.....]

Answer 3

if you need result in an array, Here is the function:
NSMutableArray*resultArray=[[NSMutableArray alloc]init];
for(int i=0; i<arrProductSelectionB.count;i++){
if ([[arrProductSelectionB objectAtIndex:i]isEqualToString:#"selected"]) {
[resultArray addObject:[arrProductSelection objectAtIndex:i]];
}
}
resultArrayhave the values which you need.

Answer 4

first i would make sure both arrays have same counters for safety something like
if (arrProductSelection.count == arrProductSelectionB) {
//than all you need is one for cycle something like :
for (int i = 0; i < arrProductionSelectionB.count; i++) {
if ([arrProductionSelectionB[i] isEqualToString: #"selected"]) {
do something magically with arrProductSelection[i];
}
}
}