FEATURE: add all method completed for kotlin SinglyLinkedList.kt

Author: MuhammadZohair

src/kotlin_lang/Main.kt

@@ -5,11 +5,15 @@ import kotlin_lang.lists.singly_linked_list.SinglyLinkedList
 fun main() {
     val singlyLinkedList: SinglyLinkedList<String> = SinglyLinkedList()
 
-    singlyLinkedList.add("Zohair")
-    println(singlyLinkedList.copyToString())
-    singlyLinkedList.add("Uzair")
-    println(singlyLinkedList.copyToString())
-    singlyLinkedList.add("Awais")
+//    singlyLinkedList.add("Zohair")
+//    println(singlyLinkedList.copyToString())
+//    singlyLinkedList.add("Uzair")
+//    println(singlyLinkedList.copyToString())
+//    singlyLinkedList.add("Awais")
+//    println(singlyLinkedList.copyToString())
+
+    val list = listOf("A", "Z", "W")
+    singlyLinkedList.addAll(list)
     println(singlyLinkedList.copyToString())
 
 

src/kotlin_lang/lists/Collection.kt

@@ -5,8 +5,9 @@ interface Collection<T> {
 
     fun add(var1: T): Boolean
 
-    //    fun addAll(var1: Collection<out T>?): Boolean
-//
+    fun addAll(list: List<T>): Boolean
+
+
 //    operator fun contains(var1: T): Boolean
 //
 //    fun containsAll(var1: Collection<*>?): Boolean

src/kotlin_lang/lists/singly_linked_list/SinglyLinkedList.kt

@@ -8,27 +8,10 @@ class SinglyLinkedList<T> : Collection<T> {
     private var firstItem: Node<T>? = null
     private var sizeOfList: Int = 0
 
-
-    data class Node<T>(var info: T, var nextRef: Node<T>?)
-
     override fun size(): Int {
         return sizeOfList
     }
 
-    override fun copyToString(): String? {
-        val stringBuilder: StringBuilder = StringBuilder()
-        var tempNode = firstItem
-        while (tempNode?.nextRef != null) {
-            stringBuilder.append(" ").append(tempNode.info).append(" ")
-            tempNode = tempNode.nextRef
-        }
-        stringBuilder.append(" ").append(tempNode?.info).append(" ")
-
-        stringBuilder.append("\n")
-        return stringBuilder.toString()
-
-    }
-
     override fun add(var1: T): Boolean {
         val newNode: Node<T> = Node(var1, null)
 
@@ -47,4 +30,28 @@ class SinglyLinkedList<T> : Collection<T> {
         sizeOfList++
         return true
     }
+
+
+    override fun addAll(list: List<T>): Boolean {
+        for (item in list) {
+            add(item)
+        }
+        return true
+    }
+
+    override fun copyToString(): String {
+        val stringBuilder: StringBuilder = StringBuilder()
+        var tempNode = firstItem
+        while (tempNode?.nextRef != null) {
+            stringBuilder.append(" ").append(tempNode.info).append(" ")
+            tempNode = tempNode.nextRef
+        }
+        stringBuilder.append(" ").append(tempNode?.info).append(" ")
+
+        stringBuilder.append("\n")
+        return stringBuilder.toString()
+
+    }
+
+    data class Node<T>(var info: T, var nextRef: Node<T>?)
 }