Hi Friends, 

I am trying to implement some client-side search in a Lightning Component.  It is working when a search term is found. But when I clear out the seach input box the data does not revert to its original state. 

It looks like my original data attribute is overwritten when I  call component.set() with the search results. I have tried making a close of the original data aray with slice(). But that has not worked either. 
Could I get anyone to take a look at the code and tell what I need to do to change state when the search results array is empy.
Here is the component code. 

<div>
              <lightning:input class="searchBar" name="search-send-list" label="Search                         
                  Email Send List" type="search"
                    placeholder="Seach Send List" onchange="{!c.handleSearch}"/                 </div>

Here is the controller 
 

handleSearch : function (component, event, helper) {

        const currentSendList = component.get("v.data");
        let searchTerm = [];
        let searchResults = [];
        searchTerm = event.getSource().get("v.value").toLowerCase();

        if (searchTerm.length > 3){
            for (let i = 0; i < currentSendList.length; i++){
                console.log(currentSendList[i].Last_Name.toLowerCase().indexOf(searchTerm) != -1)
                if(currentSendList[i].Last_Name.toLowerCase().indexOf(searchTerm) != -1){
                    searchResults.push(currentSendList[i]);
                }
            }
        }
        console.log(searchResults.length);
        if (searchResults.length > 0){
            component.set("v.data", searchResults)
        }else {

        }
        console.log(currentSendList);
        console.log(searchTerm);
        console.log('current search results = ' + searchResults);
    }