Carry out the following steps to develop a Lightning JavaScript Helper which is used for searching accounts, using the Salesforce Developer Console:

1. Click on the Setup gear icon, as shown in the following screenshot:

The Setup gear icon is located in the top right-hand area of the main Home page.

2. Click the Developer Console option, as shown in the following screenshot:

3. In the resulting Developer Console window, open the resource or click on the tab for the Lightning Component accountSearchBeforeCreate.cmp.
4. Click on HELPER (or press Ctrl + Shift + 3), as shown in the following screenshot:

5. In the resulting Lightning JavaScript Helper edit page, paste the following code:

({ SearchHelper: function(component, event) { 
   var action = component.get("c.getAccounts"); 
   action.setParams({'psSearchText':
   component.get("v.searchString") 
   }); 
   action.setCallback(this, function(response) { 
    var state = response.getState(); 
    if (state === "SUCCESS") { 
       var returnValue = response.getReturnValue(); 
       // if nothing is returned allow user to create an
       account. 
       if (returnValue.length == 0) { 
         component.set("v.createStatus", true); } 
       else { 
              component.set("v.createStatus", false); 
            } 
        // Set the Component attributes 
        component.set("v.searchCounts",
        returnValue.length); 
        component.set("v.searchResult", returnValue); 
        } 
        }); 
        $A.enqueueAction(action);  
    }, 
}) 
 

6. Click on File.
7. Click on Save, as shown in the following screenshot: