join separate components

Array.swift

// 配列を区切り文字で連結

(Obj-C)
NSArray *array = @[@"1",@"2",@"3",@"4",@"5"];
NSString *joinedString = [array componentsJoinedByString:@","];

(Swift)
let joinedString = ["1", "2", "3", "4", "5"].joinWithSeparator(",")
//=> "1,2,3,4,5"


// 文字列を指定文字で配列に分割

(Obj-C)
NSString *str = @"1,2,3,4,5";
NSArray *separatedString = [str componentsSeparatedByString:@","];


(Swift)
let separatedString = "1,2,3,4,5".componentsSeparatedByString(",")
//=> ["1", "2", "3", "4", "5"]

or

extension String : CollectionType {}
let separatedString = "1,2,3,4,5".split {$0 == ","}
//=> ["1", "2", "3", "4", "5"]