Checking the existane of a particular character in an array of strings

Question

i have an array of strings say for example @"123",@"373",@"221",@"921" .I need to check in how many elements of that array 2 exists and want to concatenate those elements into a mutable string and finally eradicate all two and prepare a string.I should have a string 13373191 out of the above example

Answer 1

Instead of doing it for you, here are a few links that will help you figure this out for yourself:

1. Fast enumeration lets you iterate through the members of your NSArray
2. If you get back an NSRange value from running -rangeOfCharacterFromSet: on each string, then the string contains the character you're looking for. If you get an NSRange value representing {NSNotFound, 0} then your string does not contain the character(s)
3. You can use -componentsSeparatedByCharactersInSet: to split each element of the array by your character
4. You can then use fast enumeration to iterate through each of these split components, using -stringByAppendingString to glue them together

All those links will take you to Apple's documentation that explains each of the concepts and methods.

EDIT - Added Sbrocket's clarification.