my code contains two lightning: datatable where I pass two lists respectively. The first list "prodList" I need to show the products in the first lightning: datatable the second checks my cart. Having said that I have a question, when I go to select a product in the table as seen in the picture, a popup appears with a lightning in it: input which I need to make the user enter the desired quantity of that product. My list contains an "Available Quantity" field, when I go to select a product and enter the quantity you want it makes me a check where I subtract the quantity chosen by the user from the "Available quantity", how do I update the list and automatically check the updated value in the Available Quantity?
CMP

<!-- Create Datatable -->   
    <aura:attribute type="Product2__c[]" name="prodList"/>
    <aura:attribute type="Product2__c[]" name="prodList2"/>
    <aura:attribute name="control" type="Boolean" default='false'/>
    <aura:attribute name="mycolumns" type="List"/>
    <aura:attribute name="Counter" type="Integer" default="0" />
    <aura:handler name="init" value="{! this }" action="{! c.init }"/>
    <div class="container" style="height:250px ; padding:10px ; ">
        
        <lightning:datatable class="datatable1"                            
                             data="{! v.prodList }"     
                             columns="{! v.mycolumns }"     
                             keyField="Id"
                             showRowNumberColumn="true" 
                             editable="true"
                             onrowselection="{! c.getSelectedProd }"
                             />
    </div>
    <!-- Create Popup -->
    <aura:attribute name="popup" type="Boolean" default="false"/>
    <aura:attribute name="quantity" type="Integer" default="0"/>
    <aura:attribute name="Name" type="String" default="Name"/>
    <aura:attribute name="AQuantity" type="Integer" default="0"/>
    <aura:attribute name="id" type="String" default="id"/>
    <aura:if isTrue="{!v.popup}">
        <div>
            <section role="dialog" tabindex="-1" aria-label="Meaningful description of the modal content" aria-describedby="modal-content-id-1" class="slds-modal slds-fade-in-open">
                <div class="slds-modal__container">
                    <header class="slds-modal__header">
                        <button class="slds-button slds-button_icon slds-modal__close slds-button_icon-inverse" title="Close" onclick="{!c.closeBtn}">
                            <lightning:icon iconName="utility:close" size="small" variant="neutral"/>
                            <span class="slds-assistive-text">Close</span>
                        </button>
                        <h2 id="modal-heading-01" class="slds-text-heading_medium slds-hyphenate">{!v.Name}</h2>
                        
                    </header>
                    
                    <div class="slds-modal__content slds-p-around_medium alignLeft" id="modal-content-id-1">
                        <lightning:card>
                            <div >
                                <lightning:layout>
                                    <lightning:layoutItem padding="around-small">
                                        <div class="position">
                                            <lightning:buttonIcon  iconName="utility:add" alternativeText="Add" title="Add" onclick="{!c.increment}" variant="brand"/></div>
                                    </lightning:layoutItem>
                                    <lightning:layoutItem padding="around-small">
                                        <lightning:input type="number" value="{!v.quantity}" name="ItemPrice" class="luigi"
                                                         label="Quantity" step="1" aura:id="prova" />
                                        
                                    </lightning:layoutItem>
                                    <lightning:layoutItem padding="around-small">
                                        <lightning:buttonIcon iconName="utility:dash" alternativeText="Add" title="Add" onclick="{!c.decrement}" variant="brand"/>
                                    </lightning:layoutItem>
                                </lightning:layout>
                            </div>
                        </lightning:card>
                        
                        
                    </div>
                    <footer class="slds-modal__footer">
                        <lightning:button label="Yes"
                                          variant="brand" class="slds-m-top--medium"
                                          onclick="{!c.yesBtn}"/>
                        <lightning:button label="No"
                                          variant="brand" class="slds-m-top--medium"
                                          onclick="{!c.noBtn}"/>
                    </footer>
                </div>
            </section>
            <div class="slds-backdrop slds-backdrop_open"></div>
        </div>
    </aura:if>

Controller:

clickBook: function (cmp, event, helper) {
        cmp.set('v.mycolumns', [
            { label: 'Name Number', fieldName: 'Name'},
            { label: 'Product Name', fieldName: 'Name__c', type: 'text'},
            { label: 'Weight For Single Product', fieldName: 'WeightForSingleProduct__c', type: 'number'},
            { label: 'Available Quantity', fieldName: 'AvailableQuantity__c', type: 'number'},
            { label: 'Genre', fieldName: 'GenreBook__c', type: 'text'},
            
        ]);
            helper.getData(cmp);
            },
            getSelectedProd: function (component, event) {
            component.set("v.popup",true);
            var selectedRows = event.getParam('selectedRows');
            console.log('selRows -> ' + JSON.stringify(selectedRows));
            var selectedRowsIds = [];
                for(var i=0;i<selectedRows.length;i++){
            selectedRowsIds.push(selectedRows[i].Id);
            component.set("v.AQuantity",selectedRows[i].AvailableQuantity__c);
            component.set("v.Name", selectedRows[i].Name__c);
            component.set("v.id", selectedRows[i].Id);
        }     
        component.set( "v.prodList2", selectedRows );           
        var list = component.get("v.prodList2");
        component.set('v.Counter', list.length);
        if(list.length==0){
            component.set("v.control",false);
        }
        else{
            console.log("Size = "+list.length);
        }
    },
    handleClick : function (component, event, helper) {
        component.set( "v.control", true );
        
    },
    yesBtn : function(component,event,helper){
        var qty=component.find("prova").get("v.value");
        var name=component.get("v.Name");
        var aquantity=component.get("v.AQuantity");
        console.log("id book "+component.get("v.id"));
        if(qty>aquantity){
            var toastEvent = $A.get("e.force:showToast");
            toastEvent.setParams({
                title : 'Error',
                message: 'the quantity you want exceeds that available',
                duration:' 5000',
                key: 'info_alt',
                type: 'Error',
                mode: 'pester'
            });
            toastEvent.fire();
        }
        else{
            var rquantity=aquantity-qty;
            console.log("Available quantity - quantity = " +rquantity);
            //problem
            console.set("v.prodList[v.id].AvailableQuantity__c",rquantity);
        }
        var toastEvent = $A.get("e.force:showToast");
        toastEvent.setParams({
            title : 'Success',
            message: name+' added to cart quantity ='+quality,
            duration:' 5000',
            key: 'info_alt',
            type: 'success',
            mode: 'pester'
        });
        toastEvent.fire();
        component.set( "v.popup", false );
    },