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
or short:
var str = “Hello, playground”
var reverseStr = “”
for character in str {
reverseStr = character + reverseStr
}
Thanks for the suggestion.
for char in identityNumber{
reversedString = char + reversedString
}
‘String’ is not convertible to ‘Character’
Looks like some changes have been introduced in Xcode 6 beta 6. Here is the fix.
var str = “Hello, playground”
var reverseStr = “”
for character in str {
reverseStr = String(character) + reverseStr
}
Even simpler, using the builtin collections functions:
var str = “abcdef”
var revStr = String(reverse(str))