Dynamics 365 CE: Set a field visible using JavaScript

The following JavaScript code can be used to make a field Visible in Dynamics 365 app. 

function showField(executionContext){

    var formContext = executionContext.getFormContext();

    var attributename = formContext.getAttribute("attributename");

    if (attributename == true){

        formContext.getControl("attributename1").setVisible(false);

    }

}