SampleAuraController.js Lightning Component

SampleAuraController.js

({
  'showAccount' : function(cmp, ev, helper) {
    // First Request 
    var actionOne = cmp.get('c.firstRequest');
    actionOne.setParams({ accountId : '001xxxxxxxxxxxx' });
    actionOne.setCallback(this, function(res) {
      var stateOne = res.getState();
      if(stateOne === 'SUCCESS') {
        console.log('First From Server-Side: ' + res.getReturnValue());
        // Second Request 
	var actionTwo = cmp.get('c.secondRequest');
	actionTwo.setParams({ accountId : '001xxxxxxxxxxxx' });
	actionTwo.setCallback(this, function(res) {
	  var stateTwo = res.getState();
	  if(stateTwo === 'SUCCESS') {
	    console.log('Second From Server-Side: ' + res.getReturnValue());
	  } else if(stateTwo === 'ERROR') {
            console.error('ERROR: ' + res.getError());
	  }
	});
	$A.enqueueAction(actionTwo);			
      }
      else if(stateOne === 'ERROR') {
        console.error('ERROR: ' + res.getError());
      }
    });
    $A.enqueueAction(actionOne);
  }
})