How do I concatenate strings in Swift?

Question

How to concatenate string in Swift?

In Objective-C we do like

NSString *string = @\"Swift\";
NSString *resultStr = [string stringByAppen         


        

Answer 1

You could use SwiftString (https://github.com/amayne/SwiftString) to do this.

"".join(["string1", "string2", "string3"]) // "string1string2string"
" ".join(["hello", "world"]) // "hello world"

DISCLAIMER: I wrote this extension

Answer 2

One can also use stringByAppendingFormat in Swift.

var finalString : NSString = NSString(string: "Hello")
finalString = finalString.stringByAppendingFormat("%@", " World")
print(finalString) //Output:- Hello World
finalString = finalString.stringByAppendingFormat("%@", " Of People")
print(finalString) //Output:- Hello World Of People

Answer 3

You can add a string in these ways:

• str += ""
• str = str + ""
• str = str + str2
• str = "" + ""
• str = "\(variable)"
• str = str + "\(variable)"

I think I named them all.

Answer 4

\ this is being used to append one string to another string.

var first = "Hi" 
var combineStr = "\(first) Start develop app for swift"

You can try this also:- + keyword.

 var first = "Hi" 
 var combineStr = "+(first) Start develop app for swift"

Try this code.

Answer 5

From: Matt Neuburg Book “iOS 13 Programming Fundamentals with Swift.” :

To combine (concatenate) two strings, the simplest approach is to use the + operator:

let s = "hello"
let s2 = " world"
let greeting = s + s2

This convenient notation is possible because the + operator is overloaded: it does one thing when the operands are numbers (numeric addition) and another when the operands are strings (concatenation). The + operator comes with a += assignment shortcut; naturally, the variable on the left side must have been declared with var:

var s = "hello"
let s2 = " world"
s += s2

As an alternative to +=, you can call the append(_:) instance method:

var s = "hello"
let s2 = " world"
s.append(s2)

Another way of concatenating strings is with the joined(separator:) method. You start with an array of strings to be concatenated, and hand it the string that is to be inserted between all of them:

let s = "hello"
let s2 = "world"
let space = " "
let greeting = [s,s2].joined(separator:space)

Answer 6

Swift 5

You can achieve it using appending API. This returns a new string made by appending a given string to the receiver.

API Details : here

Use:

var text = "Hello"
text = text.appending(" Namaste")

Result:

Hello
Hello Namaste