Q:

Objective-C Simplest way to create comma separated string from an array of objects

So I have a nsmutablearray with a bunch of objects in it.  I want to create a comma separated string of the id value of each object.

A:

Use the NSArray instance method componentsJoinedByString:.
In Objective-C:
- (NSString *)componentsJoinedByString:(NSString *)separator

In Swift:
func componentsJoinedByString(separator: String) -> String

Example:
In Objective-C:
NSString *joinedComponents = [array componentsJoinedByString:@","];

In Swift:
let joinedComponents = array.joined(seperator: ",")

A:

If you're searching for the same solution in Swift, you can use this:
var array:Array<String> = ["string1", "string2", "string3"]
var commaSeperatedString = ", ".join(array) // Results in string1, string2, string3

To make sure your array doesn't contains nil values, you can use a filter:
array = array.filter { (stringValue) -> Bool in
    return stringValue != nil && stringValue != ""
}

A:

Create String from Array:
-(NSString *)convertToCommaSeparatedFromArray:(NSArray*)array{
    return [array componentsJoinedByString:@","];
}

Create Array from String:
-(NSArray *)convertToArrayFromCommaSeparated:(NSString*)string{
    return [string componentsSeparatedByString:@","];
}

