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displayToast : function (component, event, helper) {
    var toast = $A.get("e.force:showToast");
    if (toast){
        //fire the toast event in Salesforce1
        toast.setParams({
            "title": "Success!",
            "message": "The component loaded successfully."
        });
        toast.fire();
    } else {
        //your toast implementation for a standalone app here
    }
}