Completed lab

src/main/java/com/zipcodewilmington/StringArrayUtils.java

@@ -1,39 +1,56 @@
 package com.zipcodewilmington;
 
+import java.util.Arrays;
+
 /**
  * Created by leon on 1/29/18.
  */
 public class StringArrayUtils {
     /**
      * @param array array of String objects
-     * @return first element of specified array
      */ // TODO
     public static String getFirstElement(String[] array) {
-        return array[0];
+        String result = null;
+        if (array != null && array.length >= 1) {
+            result = array[0];
+        }
+        return result;
     }
 
     /**
      * @param array array of String objects
      * @return second element in specified array
      */
     public static String getSecondElement(String[] array) {
-        return array[1];
+        String result = null;
+        if (array != null && array.length >= 2) {
+            result = array[1];
+        }
+        return result;
     }
 
     /**
      * @param array array of String objects
      * @return last element in specified array
      */ // TODO
     public static String getLastElement(String[] array) {
-        return null;
+        String result = null;
+        if (array != null && array.length > 0) {
+            result = array[array.length - 1];
+        }
+        return result;
     }
 
     /**
      * @param array array of String objects
      * @return second to last element in specified array
      */ // TODO
     public static String getSecondToLastElement(String[] array) {
-        return null;
+        String result = null;
+        if (array != null && array.length >= 2) {
+            result = array[array.length - 2];
+        }
+        return result;
     }
 
     /**
@@ -42,6 +59,13 @@ public static String getSecondToLastElement(String[] array) {
      * @return true if the array contains the specified `value`
      */ // TODO
     public static boolean contains(String[] array, String value) {
+        for(int i = 0; i< array.length; i++){
+            String s = array[i];
+            if(array[i].contains(value)){
+                return true;
+            }
+        }
+
         return false;
     }
 
@@ -50,32 +74,70 @@ public static boolean contains(String[] array, String value) {
      * @return an array with identical contents in reverse order
      */ // TODO
     public static String[] reverse(String[] array) {
-        return null;
+        StringBuilder reverse = new StringBuilder();
+        int len = array.length;
+        for(int i = len ; i>0 ; i--){
+           reverse.append(array[i-1]).append(" ");
+        }
+        String[] reversed  = reverse.toString().split(" ");
+        return reversed;
     }
 
     /**
      * @param array array of String objects
      * @return true if the order of the array is the same backwards and forwards
      */ // TODO
     public static boolean isPalindromic(String[] array) {
-        return false;
+        int len = array.length;
+        for(int i =0; i< (len/2);i++){
+            if(array[i] != array[len-i-1]){
+                return false;
+            }
+        }
+        return true;
     }
 
     /**
      * @param array array of String objects
      * @return true if each letter in the alphabet has been used in the array
      */ // TODO
     public static boolean isPangramic(String[] array) {
-        return false;
+
+        boolean[] used = new boolean[26];
+        for(int i = 0; i < array.length; i++){
+            String word = array[i].toUpperCase();
+            for (int j = 0; j < word.length(); j++) {
+
+                if (word.charAt(j) >= 'A' && word.charAt(j) <= 'Z') {
+                    int foundLetterIndex = word.charAt(j) - 'A';
+                    used[foundLetterIndex] = true;
+                }
+            }
+        }
+
+        for (int k = 0; k < used.length; k++) {
+            if (!used[k]) {
+                return false;
+            }
+        }
+        return true;
     }
 
+
+
     /**
      * @param array array of String objects
      * @param value value to check array for
      * @return number of occurrences the specified `value` has occurred
      */ // TODO
     public static int getNumberOfOccurrences(String[] array, String value) {
-        return 0;
+        int count = 0;
+        for(int i = 0; i < array.length; i++){
+            if(array[i] == value){
+                count++;
+            }
+        }
+        return count;
     }
 
     /**
@@ -84,23 +146,49 @@ public static int getNumberOfOccurrences(String[] array, String value) {
      * @return array with identical contents excluding values of `value`
      */ // TODO
     public static String[] removeValue(String[] array, String valueToRemove) {
-        return null;
+        String[] result = new String[array.length-1];
+        int resultIndex = 0;
+        for(int i = 0; i < array.length; i++){
+            if(!array[i].equals(valueToRemove)){
+                result[resultIndex++] = array[i];
+            }
+        }
+        return result;
     }
 
     /**
      * @param array array of chars
      * @return array of Strings with consecutive duplicates removes
      */ // TODO
     public static String[] removeConsecutiveDuplicates(String[] array) {
-        return null;
+        StringBuilder s = new StringBuilder();
+        for (int i = 0; i < array.length - 1; i++) {
+            if (!array[i].equals(array[i + 1])) {
+                s.append(array[i]).append(" ");
+            }
+        }
+        s.append(array[array.length-1]);
+        return s.toString().split(" ");
     }
 
     /**
      * @param array array of chars
      * @return array of Strings with each consecutive duplicate occurrence concatenated as a single string in an array of Strings
      */ // TODO
     public static String[] packConsecutiveDuplicates(String[] array) {
-        return null;
+        StringBuilder s= new StringBuilder();
+        for(int i = 0; i< array.length-1; i++){
+
+            if(array[i].equals(array[i+1])){
+                s.append(array[i]);
+            }else
+            {
+                s.append(array[i]);
+                s.append(" ");
+            }
+        }
+        s.append(array[array.length-1]);
+        return s.toString().split(" ");
     }
 
 

src/test/java/com/zipcodewilmington/GetConsecutiveDuplicatesTest.java

@@ -17,6 +17,8 @@ public void testRemoveConsecutiveDuplicates1() {
 
 
 
+
+
     @Test
     public void testRemoveConsecutiveDuplicates2() {
         String[] array = {"aba", "aba", "baa", "bab", "bba", "zzz", "bba", "bba", "bba", "bbb", "bbb"};