CODEWITHSUNDEEP
iosobjective-cswift
user3733309
user3733309

Reputation:

Append String in Swift

I am new to iOS. I am currently studying iOS using Objective-C and Swift.

To append a string in Objective-C I am using following code:

 NSString *string1 = @"This is";
 NSString *string2 = @"Swift Language";
 NSString *appendString=[NSString stringWithFormat:@"%@ %@",string1,string2];
 NSLog(@"APPEND STRING:%@",appendString);

Anyone please guide me.

Upvotes: 78

Views: 142267

Answers (12)

Gr8Warrior
Gr8Warrior

Reputation: 719

According to Swift 4 Documentation, String values can be added together (or concatenated) with the addition operator (+) to create a new String value:

let string1 = "hello"
let string2 = " there"
var welcome = string1 + string2
// welcome now equals "hello there"

You can also append a String value to an existing String variable with the addition assignment operator (+=):

var instruction = "look over"
instruction += string2
// instruction now equals "look over there"

You can append a Character value to a String variable with the String type’s append() method:

let exclamationMark: Character = "!"
welcome.append(exclamationMark)
// welcome now equals "hello there!"

Upvotes: 4

Paresh Hirpara
Paresh Hirpara

Reputation: 487

let firstname = "paresh"
let lastname = "hirpara"
let itsme = "\(firstname) \(lastname)"

Upvotes: 0

Ilker Baltaci
Ilker Baltaci

Reputation: 11779

SWIFT 2.x

let extendedURLString = urlString.stringByAppendingString("&requireslogin=true")

SWIFT 3.0

From Documentation: "You can append a Character value to a String variable with the String type’s append() method:" so we cannot use append for Strings.

urlString += "&requireslogin=true"

"+" Operator works in both versions

let extendedURLString = urlString+"&requireslogin=true"

Upvotes: 0

Esqarrouth
Esqarrouth

Reputation: 39181

Add this extension somewhere:

extension String {
    mutating func addString(str: String) {
        self = self + str
    }
}

Then you can call it like:

var str1 = "hi"
var str2 = " my name is"
str1.addString(str2)
println(str1) //hi my name is

A lot of good Swift extensions like this are in my repo here, check them out: https://github.com/goktugyil/EZSwiftExtensions

Upvotes: 8

Melvin
Melvin

Reputation: 3431

> Swift2.x:

String("hello ").stringByAppendingString("world") // hello world

Upvotes: 1

PREMKUMAR
PREMKUMAR

Reputation: 8349

Its very simple:

For ObjC:

     NSString *string1 = @"This is";
     NSString *string2 = @"Swift Language";

ForSwift:

    let string1 = "This is"
    let string2 = "Swift Language"

For ObjC AppendString: 

     NSString *appendString=[NSString stringWithFormat:@"%@ %@",string1,string2];

For Swift AppendString: 

    var appendString1 = "\(string1) \(string2)"
    var appendString2 = string1+string2

Result: 

    print("APPEND STRING 1:\(appendString1)")
    print("APPEND STRING 2:\(appendString2)")

Complete Code In Swift:

    let string1 = "This is"
    let string2 = "Swift Language"
    var appendString = "\(string1) \(string2)"
    var appendString1 = string1+string2
    print("APPEND STRING1:\(appendString1)")
    print("APPEND STRING2:\(appendString2)")

Upvotes: 118

ROSSiDEAS
ROSSiDEAS

Reputation: 21

In the accepted answer PREMKUMAR there are a couple of errors in his Complete code in Swift answer. First print should read (appendString) and Second print should read (appendString1). Also, updated println deprecated in Swift 2.0

His

let string1 = "This is"
let string2 = "Swift Language"
var appendString = "\(string1) \(string2)"
var appendString1 = string1+string2
println("APPEND STRING1:\(appendString1)")
println("APPEND STRING2:\(appendString2)")

Corrected

let string1 = "This is"
let string2 = "Swift Language"
var appendString = "\(string1) \(string2)"
var appendString1 = string1+string2
print("APPEND STRING:\(appendString)")
print("APPEND STRING1:\(appendString1)")

Upvotes: 0

Shanmugasundharam
Shanmugasundharam

Reputation: 2092

Strings concatenate in Swift language.

let string1 = "one"

let string2 = "two"

var concate = " (string1) (string2)"

playgroud output is "one two"

Upvotes: 0

Saurav Nagpal
Saurav Nagpal

Reputation: 1267

You can simply append string like:

var worldArg = "world is good"

worldArg += " to live";

Upvotes: 5

Anbu.Karthik
Anbu.Karthik

Reputation: 82759

let string2 = " there"
var instruction = "look over"

choice 1 :

 instruction += string2;

  println(instruction)

choice 2:

 var Str = instruction + string2;

 println(Str)

ref this

Upvotes: 8

nicael
nicael

Reputation: 18997

var string1 = "This is ";
var string2 = "Swift Language";
var appendString = string1 + string2;
println("APPEND STRING: \(appendString)");

Upvotes: 4

Isaac Drachman
Isaac Drachman

Reputation: 994

In Swift, appending strings is as easy as:

let stringA = "this is a string"
let stringB = "this is also a string"
let stringC = stringA + stringB

Or you can use string interpolation.

let stringC = "\(stringA) \(stringB)"

Notice there will now be whitespace between them.

Note: I see the other answers are using var a lot. The strings aren't changing and therefore should be declared using let. I know this is a small exercise, but it's good to get into the habit of best practices. Especially because that's a big feature of Swift.

Upvotes: 21

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