Group same named NSURLComponents queryItems into NSDictionary as array - objective-c

Question

With no objective-C knowledge I am currently stuck at, what would be a simple task in other languages I know.
For a query string like this:
name1=value1&name2=value2&name1=value3
I need to end up with a NSDictionary in this shape:
#{
#"name1": #{
someField: #[
#"value1",
#"value3",
]
anotherField: #YES,
},
#"name2": #{
someField: #[
#"value2",
]
anotherField: #YES,
}
}
In javascript I could solve this by:
queryItems.reduce((result, item) => {
resultItem = result[item.name] || {
someField: [],
anotherField: true,
}
resultItem.someField.push(item.value)
return {
...result,
[item.name]: resultItem,
}
}, {})
I found this How do I convert url.query to a dictionary in Swift? but I am stuck with Objective-C in this project.

Answer 1

Check the function bellow. I hope I understand what you mean.
NSDictionary* queryItemsToDictionary(NSString* items) {
NSURLComponents* components = [[NSURLComponents alloc] initWithString:[#"?" stringByAppendingString:items]];
NSMutableDictionary* result = [NSMutableDictionary new];
for (NSURLQueryItem* item in components.queryItems) {
NSDictionary* valueForItem = [result objectForKey:item.name];
NSArray* someFieldValues = [valueForItem objectForKey:#"someField"];
if (someFieldValues == nil) {
someFieldValues = #[];
}
[result setObject:#{
#"someField": [someFieldValues arrayByAddingObject:item.value],
#"anotherField": #YES
} forKey:item.name];
}
return result;
}
This is how you can try it:
NSDictionary* dictionary = queryItemsToDictionary(#"name1=value1&name2=value2&name1=value3");
NSLog(#"%#", dictionary);