Reverse a String in Swift

Here is a simple code snippet written in Swift programming language for reversing a string.

import Cocoa

` `

//Assigning a value to a String variable

var str = "Hello, playground"

` `

//Create empty character Array.

var strArray:Character[] = Character[]()

` `

//Loop through each character in the String

for character in str {

//Insert the character in the Array variable.

strArray.append(character)

}

` `

//Create a empty string

var reversedStr:String = ""

` `

//Read the array from backwards to get the characters

for var index = strArray.count - 1; index >= 0;--index {

//Concatenate character to String.

reversedStr += strArray[index]

}

` `

reversedStr

` `

the shorter version to reverse is (thanks Andreas)

` `

var str = “Hello, playground”

var reverseStr = “”

for character in str {
reverseStr = character + reverseStr
}

This code snippet demonstrates the following.

• How to assign a value to variable.

• How to create an Array of Characters and assign empty value.(Character)

• Iterate over the string using for-in loop.

• How to add new elements to an Array.

• How to create empty String variable.

• Use the standard for loop to traverse through an array.

• Concatenate Strings and character

• Using for .. in