Swap Case Coderbyte Solution

Have the function SwapCase(str) take the str parameter and swap the case of each character. 

For example: if str is "Hello World" the output should be hELLO wORLD. Let numbers and symbols stay the way they are.

swap case in java Coderbyte

import java.util.Scanner;

public class SwapCase {

final String UPPER = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

final String LOWER = UPPER.toLowerCase();

String SwapCase(String str) {

StringBuilder result = new StringBuilder("");

for (char c : str.toCharArray()) {

int index = UPPER.indexOf(c);

if (index != -1) {

result.append(LOWER.charAt(index));

} else {

index = LOWER.indexOf(c);

if (index != -1) {

result.append(UPPER.charAt(index));

} else {

result.append(c);

}

}

}

return result.toString();

}

public static void main (String[] args) {

// keep this function call here

Scanner s = new Scanner(System.in);

SwapCase c = new SwapCase();

System.out.print(c.SwapCase(s.nextLine()));

}

}

swap case in javascript

Using the JavaScript language, have the function SwapCase(str) take the str parameter and swap the case of each character. 

For example: if str is "Hello World" the output should be hELLO wORLD. Let numbers and symbols stay the way they are.

function SwapCase(str) {

var result = '';

for (var i = 0; i < str.length; i++) {

var c = str[i];

var u = c.toUpperCase();

result += u === c ? c.toLowerCase() : u;

}

return result;

}

Explanation

I am going to be using a new string to store my modified results. I am going to loop thru every character and covert it to UpperCase. Then I am going to compare that to the character in the string. If they are the same - meaning both are uppercase then I am going to return the lowercase of the character. If they are not the same then return the Uppercase character.

Disclaimer: The above Problem is generated by Coderbyte but the Solution is provided by ShouterFolk.