How to show code but hide output in RMarkdown?

Question

I want my html file to show the code, but not the output of this chunk:

```{r echo=True, include=FALSE}
fun <- function(b)
    {
    for(a in b)
        {         


        

Answer 1

For completely silencing the output, here what works for me

```{r error=FALSE, warning=FALSE, message=FALSE}
invisible({capture.output({


# Your code here
2 * 2
# etc etc


})})
```

The 5 measures used above are

1. error = FALSE
2. warning = FALSE
3. message = FALSE
4. invisible()
5. capture.output()