How can I remove duplicated substings from string? For ex. I have: aaa,bbb,ttt,bbb,rrr.
And in result I want to have aaa,bbb,ttt,rrr (deleted duplicated bbb). I hope for your help. Thanks.
You can do it like this:
NSMutableSet *seen = [NSMutableSet set];
NSMutableString *buf = [NSMutableString string];
for (NSString *s in [str componentsSeparatedByString:#","]) {
if (![seen containsObject:s]) {
[seen add:s];
[buf appendFormat:#",%#", s];
}
}
NSString *res = [buf length] ? [buf substringFromIndex:1] : #"";
Do it in three steps
1) NSArray *items = [theString componentsSeparatedByString:#","];
2) remove duplicate element from array
NSArray* array = [NSArray arrayWithObjects:#"test1", #"test2", #"test1", #"test2",#"test4", nil];
NSArray* filteredArray = [[NSArray alloc] init];
NSSet *set= [NSOrderedSet orderedSetWithArray:array];
filteredArray = [set allObjects];
3) Concate String from array
NSString *myString = [myArray componentsJoinedByString:#","];
You can use NSMutableDictionary;
In dictionary there are two elements;
1. Key
2. Value
Just set Keys as your array elements;
Special point is that 'Key' can't be duplicate;
Now just get array of Keys by using [dictionary allKeys];
Now, at this stage you have unique values in new array;
Related
I am parsing a CSV file multiple times with for loop, here I need to store these arrays one by one dictionary. There are very less questions in stack about adding NSArray to NSDictionary. I am parsing CSV with below code but I strucked at storing in NSDictionary, The program is terminating and showing warning at assigning string to dictionary
for (i=0; i<=57; i++) {
NSString *keysString = [csvArray objectAtIndex:i];
NSArray *keysArray = [keysString componentsSeparatedByString:#","];
NSLog(#"Serail No %d %#",i,keysArray);
NSString *string = [NSString stringWithFormat:#"%d", i];
NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithObjects: keysArray forKeys: string];
}
NSMutableDictionary *dict = [[NSMutableDictionary alloc]init];
for (i=0; i<=57; i++) {
NSString *keysString = [csvArray objectAtIndex:i];
NSArray *keysArray = [keysString componentsSeparatedByString:#","];
NSString *key = [NSString stringWithFormat:#"serial%d",i];
[dict setObject:keysArray forKey:key];
}
To get back data from dictionary,
NSArray *array = [dict valueForKey:#"serial24"];//to get array 24.
If I understand you correctly, you want to add the arrays to a dictionary, with the key being the string value of integer i ? What you need to do is allocate the dictionary outside your loop -
NSMutableDictionary *dict=[NSMutableDictionary new];
for (i=0; i<=57; i++) {
NSString *keysString = [csvArray objectAtIndex:i];
NSArray *keysArray = [keysString componentsSeparatedByString:#","];
NSLog(#"Serial No %d %#",i,keysArray);
NSString *string = [NSString stringWithFormat:#"%d", i];
dict[string]=keysArray;
}
I am not sure why you would want to do this, because this is basically an array. You could simply do -
NSMutableArray *outputArray=[NSMutableArray new];
for (NSString *keysString in csvArray) {
NSArray *keysArray = [keysString componentsSeparatedByString:#","];
[outputArray addObject:keysArray];
}
Pretty straightforward question:
I have an array like so:
#[#"John Doe", #"Mister Appleseed", #"Steve"];
if it has two (or more) words, I want to delete them all but the first, so the output array should looke something like this:
#[#"John", #"Mister", #"Steve"];
How do I do this?
NSArray * arr = #[#"John Doe", #"Mister Appleseed", #"Steve"];
NSMutableArray * tmp = [NSMutableArray array];
for (NSString * s in arr)
{
NSArray * cmpnts = [s componentsSeparatedByString:#" "];
[tmp addObject:cmpnts[0]];
}
arr = tmp;
Check the following code:
NSMutableArray *finalArray = [[NSMutableArray alloc] init];
NSArray *sourceArray = #[#"John Doe", #"Mister Appleseed", #"Steve"];
for(NSString *str in sourceArray){
[finalArray addObject:[str componentsSepratedByString:#" "] objectAtIndex:0]];
}
You iterate over the array of names, split each at spaces (" "), and then grab the first object: the first name.
NSArray *nameArray = #[#"Name", #"Name Two"]; // original array
NSMutable *modifiedNameArray = [NSMutableArray new]; // new mutable array to add new names
for (NSString *fullName in nameArray) { // for loop
NSString *firstName = [[fullName componentsSeparatedByString:#" "] objectAtIndex:0]; // extract first name
[modifiedNameArray addObject:firstName]; // add first name to mutable array
}
You have to have two arrays, because you cannot mutate an array while it is being used in a loop (even if it's an NSMutableArray).
I have array in this format
rows = [[NSArray alloc] initWithObjects:#"adam", #"alfred", #"ain", #"abdul", #"anastazja", #"angelica",
#"dennis" , #"deamon", #"destiny", #"dragon", #"dry", #"debug" #"drums",
#"Fredric", #"France", #"friends", #"family", #"fatish", #"funeral",
#"Mark", #"Madeline",
#"Nemesis", #"nemo", #"name",
#"Obama", #"Oprah", #"Omen", #"OMG OMG OMG", #"O-Zone", #"Ontario",
#"Zeus", #"Zebra", #"zed", nil];
But i need this in to following format
rows = #[#[#"adam", #"alfred", #"ain", #"abdul", #"anastazja", #"angelica"],
#[#"dennis" , #"deamon", #"destiny", #"dragon", #"dry", #"debug", #"drums"],
#[#"Fredric", #"France", #"friends", #"family", #"fatish", #"funeral"],
#[#"Mark", #"Madeline"],
#[#"Nemesis", #"nemo", #"name"],
#[#"Obama", #"Oprah", #"Omen", #"OMG OMG OMG", #"O-Zone", #"Ontario"],
#[#"Zeus", #"Zebra", #"zed"]];
Means that same starting character in to different dictionary
The easiest approach.
NSArray *rows = ...;
NSMutableDictionary *map = [NSMutableDictionary dictionary];
for (NSString *value in rows) {
NSString *firstLetter = [value substringToIndex:1];
if (!map[firstLetter]) {
map[firstLetter] = #[];
}
NSMutableArray *values = [map[firstLetter] mutableCopy];
[values addObject:value];
map[firstLetter] = values;
}
NSArray *finalRows = [map allValues];
Note that finalRows is not sorted.
If you want to sort your array by it's first letter, you can try this :
NSMutableArray *outputArray = [NSMutableArray new];
NSString *lastFirstLetter = nil;
for(NSString *value in rows) {
NSString *firstLetter = [[value substringToIndex:1] lowerString];
if(![lastFirstLetter isEqualToString:firstLetter]) {
lastFirstLetter = firstLetter;
[outputArray addObject:[NSMutableArray new]];
}
[[outputArray lastObject] addObject:value];
}
The idea is to iterate your input array and if the first letter of your word is different than the precedent, create a new array.
I have an array like this
A = [#"aa",#"cc",#"bb",#"bb",#"cc",#"aa",#"cc"]
I need to convert it to
A = [#"x2 aa",#"x2 bb",#"x3 cc"]
Count the similar elements and create a new string, add it to new array. As shown here:
NSArray *aArray = #[#"aa", #"cc", #"bb", #"bb", #"cc", #"aa", #"cc"];
NSCountedSet *set = [NSCountedSet setWithArray:aArray];
NSMutableArray *countedArray = [NSMutableArray new];
for (NSString *str in set) {
[countedArray addObject:[NSString stringWithFormat:#"x%ld %#",[set countForObject:str], str]];
}
NSLog(#"%#",countedArray);
Output:
(
"x2 bb",
"x2 aa",
"x3 cc" )
this is what i am using:
it works if address, city, zip.....length >0.(these field may grow in future)
self.addressInfoLbl.text = [NSString stringWithFormat:#"%#\n%#\n%#\n%#\n%#", address, city, zip, state, country];(numberofline == 0)
but if any of them length =0 then i got unnecessary new line.
i am working on manually preparing(appending \n).if there are more and more fields then doing it manuallt is really hard.
Is there any other proper way.Am i doing it right.
Thanks
Try following code. It creates array of your strings, removes empty strings and then concatenates them with componentsJoinedByString :
NSArray *strings = #[address, city, zip, state, country];
strings = [strings filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:#"length > 0"]];
NSString *resultString = [strings componentsJoinedByString:#"\n"];
You can join an array of objects into a string with a separator:
NSArray *props = [NSArray arrayWithObjects: address, city, state, nil];
NSString *joinedString = [props componentsJoinedByString:#"\n"];
and you will get:
"6th avenue\nAtlanta\nGeorgia"
If you don't know the amount of properties, use NSMutableArray instead of NSArray and add your properties at runtime.
Try this once,
NSMutableString *joinedString=[NSMutableString string];
NSArray *arr = [NSArray arrayWithObjects: address, city, state, nil];
for(NSString *str in arr)
{
if([str length]>0) [joinedString appendFormat:#"\n%#", str];
}
NSString *resultString=[joinedString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
NSLog(#"%#", resultString);
Lbl.numberOfLines=0;
Lbl.lineBreakMode=NSLineBreakByCharWrapping;
try this code, it not optimal but it can resolve youy issue
NSArray *arr = [NSArray arrayWithObjects: #"address", #"", #"state", nil];
NSString *addressInfo = #"";
for (NSString *str in arr) {
if (str.length > 0) {
addressInfo = [addressInfo stringByAppendingString:[NSString stringWithFormat:#"\n%#", str]];
}
}
if (addressInfo && ![#"" isEqualToString:addressInfo])
addressInfo = [addressInfo substringFromIndex:1];
NSLog(#"address Info = %#", addressInfo);