Lightning Component JavaScript Helper for the User Freezer Blog Post

UserFreezerHelper.js

({
    doInit : function(cmp, ev) {
        cmp.set('v.Message', 'Retrieving user details');
        var action = cmp.get("c.GetUserDetails");
        
        var self = this;
        action.setCallback(this, function(response) {
        		        self.actionResponseHandler(response, cmp, self, self.gotUserDetails, 'Retrieved User Details');
		        });
        $A.enqueueAction(action);
    },   
    gotUserDetails : function(cmp, helper, result, msg) {
		cmp.set('v.UserDetails', result);
        cmp.set('v.Message', msg);
    },
    updateCheckbox : function(cmp, ev) {
        var value=ev.getSource().get('v.value');
        var userId=ev.getSource().getElement().parentElement.id;
        var userDetails=cmp.get('v.UserDetails');
        
        for (var idx=0; idx<userDetails.length; idx++) {
            if (userDetails[idx].user.Id==userId) {
                userDetails[idx].userLogin.IsFrozen=!value;
            }
        }
        cmp.set('v.UserDetails', userDetails);
    },
    applyChanges : function(cmp, helper) {
        cmp.set('v.Message', 'Applying Changes');
        var action = cmp.get("c.UpdateUserDetails");
        var userDetails=cmp.get('v.UserDetails');
        var udAsJSON=JSON.stringify(userDetails);
		var params={
	            "toProcessAsJSON" : udAsJSON
	    }; 
        
        console.log('Params = ' + JSON.stringify(params));
        action.setParams(params);
                
        var self = this;
        action.setCallback(this, function(response) {
        		        self.actionResponseHandler(response, cmp, self, self.gotUserDetails, 'Changes Applied');
		        });
        $A.enqueueAction(action);
    },
    actionResponseHandler : function (response, component, helper, cb, cbData) {
        try
        {
            var state = response.getState();
            console.log('State = ' + state);
            if (state === "SUCCESS") {
                var retVal=response.getReturnValue();
                console.log('Result = ' + JSON.stringify(retVal));
                cb(component, helper, retVal, cbData);
                console.log('Done with callback');
            }
            else if (state === "ERROR") {
                var errors = response.getError();
                if (errors) {
                    console.log("Errors", errors);
                    if (errors[0] && errors[0].message) {
                        alert("Error message: " + errors[0].message);
                    }
                } 
                else {
                    alert("Unknown error");
                }
            }
        }
        catch (e) {
            alert('Exception in actionResponseHandler: ' + e);
        }
    }
})