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I have an NSArray with objects that have a name property.
I would like filter the array by name
NSString *alphabet = [agencyIndex objectAtIndex:indexPath.section];
//---get all states beginning with the letter---
NSPredicate *predicate =
[NSPredicate predicateWithFormat:@"SELF beginswith[c] %@", alphabet];
NSMutableArray *listSimpl = [[NSMutableArray alloc] init];
for (int i=0; i<[[Database sharedDatabase].agents count]; i++) {
Town *_town = [[Database sharedDatabase].agents objectAtIndex:i];
[listSimpl addObject:_town];
}
NSArray *states = [listSimpl filteredArrayUsingPredicate:predicate];
But I get an error - "Can't do a substring operation with something that isn't a string (lhs = <1, Arrow> rhs = A)"
How can I do this? I would like to filter the array for the first letter in name being 'A'.
351
To filter strings of an Array based on length in JavaScript, call Array. filter() method on this String Array, and pass a function as argument that returns true for the specific condition on string length or false otherwise.
One can use filter() function in JavaScript to filter the object array based on attributes. The filter() function will return a new array containing all the array elements that pass the given condition. If no elements pass the condition it returns an empty array.
You can't use filter() on a string as it is an Array.
Try with following code
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF like %@", yourName];
NSArray *filteredArr = [yourArray filteredArrayUsingPredicate:pred];
EDITED :
NSPredicate pattern should be:
NSPredicate *pred =[NSPredicate predicateWithFormat:@"name beginswith[c] %@", alphabet];
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