Reversing the Order of a String Value

Reversing the order of a string value

Commented inline,

func reverse(_ s: String) -> String {
 var str = ""
 //.characters gives the character view of the string passed. You can think of it as array of characters.
 for character in s.characters {
    str = "\(character)" + str
    //This will help you understand the logic. 
    //!+""
    //p+!
    //l+p! ... goes this way
    print ( str)
 }
 return str
}
print (reverse("!pleH"))

Reverse the order of characters within words with five letters or more

Hy Pawel Niewolak, the issue is with your reverse function.

Depending on your requirements use that:

 public static String reverse(String s) {
        String[] ori = s.split("");
        String[] rev = new String[ori.length];

        for (int i = 0; i < rev.length; i++) {
            rev[i] = ori[rev.length - i - 1];
        }
        s = "";
        for (String str : rev) {
            s += str;
        }
        return s;
    }
}

Reverse a string in Java

You can use this:

new StringBuilder(hi).reverse().toString()

StringBuilder was added in Java 5. For versions prior to Java 5, the StringBuffer class can be used instead — it has the same API.

reverse the order of characters in a string

Simple:

var="12345"
copy=${var}

len=${#copy}
for((i=$len-1;i>=0;i--)); do rev="$rev${copy:$i:1}"; done

echo "var: $var, rev: $rev"

Output:

$ bash rev
var: 12345, rev: 54321

Best way to reverse a string

public static string Reverse( string s )
{
    char[] charArray = s.ToCharArray();
    Array.Reverse(charArray);
    return new string(charArray);
}

Reverse a string in Python

Using slicing:

>>> 'hello world'[::-1]
'dlrow olleh'

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Slice notation takes the form [start:stop:step]. In this case, we omit the start and stop positions since we want the whole string. We also use step = -1, which means, "repeatedly step from right to left by 1 character".

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