<aura:event type="COMPONENT" description="Use For Add New Row"></aura:event>

<aura:event type="COMPONENT" description="Event to remove Row" >
    <aura:attribute name="indexVar" type="Integer" description="Use For Delete Row" />
</aura:event>

<aura:component >    
    <!-- Aura Attribute for store single Contact[standard Object] Instance
         And Store Index of Particular Instance --> 
    <aura:attribute name="ContactInstance" type="Contact"/>
    <aura:attribute name="rowIndex" type="String"/>
     <aura:attribute name="contactList" type="Contact[]"/> 
    <!-- Register 2 Lightning Event for handle add or Delete rows on Parent Component  --> 
    <aura:registerEvent name="DeleteRowEvt" type="c:DeleteRowEvt"/> 
    <aura:registerEvent name="AddRowEvt" type="c:AddNewRowEvt"/> 
    
    <!-- Table Row -->   
    <tr class="slds-text-title_caps">
        <td> 
            {!v.rowIndex + 1}
        </td>
        <td>
            <ui:inputText class="slds-input" value="{!v.ContactInstance.FirstName}"/>
        </td>
        <td>
            <ui:inputText class="slds-input" value="{!v.ContactInstance.LastName}"/>
        </td>
        <td>
            <ui:inputPhone class="slds-input" value="{!v.ContactInstance.Phone}"/>
        </td>
        <td>
            <!-- conditionally Display Add or Delete Icons
                 if rowIndex is 0 then show Add New Row Icon else show delete Icon
             --> 
            <aura:if isTrue="{!v.rowIndex == 0}">
                <lightning:buttonIcon size='large' iconName="utility:add" variant="bare" onclick="{! c.AddNewRow }" alternativeText="Add" disabled='{!v.contactList.length>=10}'  />
             
              <aura:set attribute="else">
                  <a onclick="{!c.removeRow}">
                   <lightning:icon variant="error" iconName="utility:delete" class="slds-icon slds-icon_small" size="small" alternativeText="icon"/>
                   <span class="slds-assistive-text">Delete Icon</span>
                  </a>
              </aura:set> 
            </aura:if>
        </td> 
    </tr>
</aura:component>

({
    AddNewRow : function(component, event, helper){
       // fire the AddNewRowEvt Lightning Event 
        component.getEvent("AddRowEvt").fire();     
    },
    
    removeRow : function(component, event, helper){
     // fire the DeleteRowEvt Lightning Event and pass the deleted Row Index to Event parameter/attribute
       component.getEvent("DeleteRowEvt").setParams({"indexVar" : component.get("v.rowIndex") }).fire();
    }, 
  
})

public with sharing class addDeleteController {
   @AuraEnabled
    public static void saveContacts(List<Contact> ListContact){
        Insert ListContact;
    }
}

<!--sfdcmonkey.com-->
<!--Parent Lightning Compomemt-->
<aura:component controller="addDeleteController" Implements="flexipage:availableForRecordHome,force:hasRecordId">
  <!--Init handler which is call doInit js function on component Load-->  
    <aura:handler name="init" value="{!this}" action="{!c.doInit}"/>
  
 <!--Event handler for Add and Delete Row Event which is fire from Child Component-->    
    <aura:handler name="DeleteRowEvt" event="c:DeleteRowEvt" action="{!c.removeDeletedRow}"/>
    <aura:handler name="AddRowEvt" event="c:AddNewRowEvt" action="{!c.addNewRow}"/>
 
 <!--Aura Attribute for store Contact Object List as Array-->    
    <aura:attribute name="contactList" type="Contact[]"/> 
 
 <!--Header Part-->        
    <div class="slds-page-header">
        <h1 class="slds-page-header__title">Create Multiple Contacts, With Add/Delete Rows Dynamically</h1>
        <p class="slds-text-body_small slds-line-height_reset">By sfdcmonkey.com</p>
    </div>
    
 <!--Table Part-->           
    <table class="slds-table slds-table_bordered slds-table_cell-buffer"> 
        <thead>
            <tr class="slds-text-title_caps">
                <th scope="col">
                    <div class="slds-truncate">S.No</div>
                </th>
                <th scope="col">
                    <div class="slds-truncate" title="First Name">First Name</div>
                </th>
                <th scope="col">
                    <div class="slds-truncate" title="Last Name">Last Name</div>
                </th>
                <th scope="col">
                    <div class="slds-truncate" title="Phone">Phone</div>
                </th>
            </tr>
        </thead>   
        <tbody>
           <!--Iterate the child Component for display Table rows 
               with pass the List Item Index for track the Every child Component 
               and pass each List Contact Instance -->         
            <aura:iteration items="{!v.contactList}" var="item" indexVar="index">
                <c:dynamicRowItem ContactInstance="{!item}" rowIndex="{!index}" contactList='{!v.contactList}' />
            </aura:iteration>
        </tbody>
    </table>
    <br/>
    <!--Save Button which is call Save js function on click --> 
    <button class="slds-button slds-button_brand" onclick="{!c.Save}">Save</button>
</aura:component>

({
 
    // function call on component Load
    doInit: function(component, event, helper) {
        // create a Default RowItem [Contact Instance] on first time Component Load
        // by call this helper function  
        helper.createObjectData(component, event);
    },
 
    // function for save the Records 
    Save: function(component, event, helper) {
        // first call the helper function in if block which will return true or false.
        // this helper function check the "first Name" will not be blank on each row.
        if (helper.validateRequired(component, event)) {
            // call the apex class method for save the Contact List
            // with pass the contact List attribute to method param.  
            var action = component.get("c.saveContacts");
            action.setParams({
                "ListContact": component.get("v.contactList")
            });
            // set call back 
            action.setCallback(this, function(response) {
                var state = response.getState();
                if (state === "SUCCESS") {
                    // if response if success then reset/blank the 'contactList' Attribute 
                    // and call the common helper method for create a default Object Data to Contact List 
                    component.set("v.contactList", []);
                    helper.createObjectData(component, event);
                    alert('record Save');
                }
            });
            // enqueue the server side action  
            $A.enqueueAction(action);
        }
    },
 
    // function for create new object Row in Contact List 
    addNewRow: function(component, event, helper) {
        // call the comman "createObjectData" helper method for add new Object Row to List  
        helper.createObjectData(component, event);
    },
 
    // function for delete the row 
    removeDeletedRow: function(component, event, helper) {
        // get the selected row Index for delete, from Lightning Event Attribute  
        var index = event.getParam("indexVar");
        // get the all List (contactList attribute) and remove the Object Element Using splice method    
        var AllRowsList = component.get("v.contactList");
        AllRowsList.splice(index, 1);
        // set the contactList after remove selected row element  
        component.set("v.contactList", AllRowsList);
    },
})

({
    createObjectData: function(component, event) {
        // get the contactList from component and add(push) New Object to List  
        var RowItemList = component.get("v.contactList");
        RowItemList.push({
            'sobjectType': 'Contact',
            'FirstName': '',
            'LastName': '',
            'Phone': ''
        });
        // set the updated list to attribute (contactList) again    
        component.set("v.contactList", RowItemList);
    },
    // helper function for check if first Name is not null/blank on save  
    validateRequired: function(component, event) {
        var isValid = true;
        var allContactRows = component.get("v.contactList");
        for (var indexVar = 0; indexVar < allContactRows.length; indexVar++) {
            if (allContactRows[indexVar].FirstName == '') {
                isValid = false;
                alert('First Name Can\'t be Blank on Row Number ' + (indexVar + 1));
            }
        }
        return isValid;
    },
})

<aura:application extends="force:slds">
    <c:dynamicRow/>
<!-- here c: is org. default namespace prefix-->
</aura:application>