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/**

* CodingBat examples from Chapter 8.

*/

public class CodingBat {

/**

* See https://codingbat.com/prob/p118230.

*/

public String noX(String str) {

if (str.length() == 0) {

return "";

}

char first = str.charAt(0);

String rest = str.substring(1);

String recurse = noX(rest);

if (first == 'x') {

return recurse;

} else {

return first + recurse;

}

}

/**

* See https://codingbat.com/prob/p135988.

*/

public int array11(int[] nums, int index) {

if (index >= nums.length) {

return 0;

}

int recurse = array11(nums, index + 1);

if (nums[index] == 11) {

return recurse + 1;

} else {

return recurse;

}

}

}