R Under development (unstable) (2024-02-26 r85990 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> if (suppressPackageStartupMessages(requireNamespace("knitr", quietly = TRUE))) {
+     require(knitr)
+     knit("knitr.Rmd", quiet=TRUE)
+     cat(readLines("knitr.md"), sep="\n")
+     invisible(file.remove("knitr.md"))
+ } else {
+     cat(readLines("knitr.Rout.mock", warn = FALSE), sep="\n")
+ }
Loading required package: knitr

```r
require(data.table)              # print?
DT = data.table(x=1:3, y=4:6)    # no
DT                               # yes
```

```
##        x     y
##    <int> <int>
## 1:     1     4
## 2:     2     5
## 3:     3     6
```

```r
DT[, z := 7:9]                   # no
print(DT[, z := 10:12])          # yes
```

```
##        x     y     z
##    <int> <int> <int>
## 1:     1     4    10
## 2:     2     5    11
## 3:     3     6    12
```

```r
if (1 < 2) DT[, a := 1L]         # no
DT                               # yes
```

```
##        x     y     z     a
##    <int> <int> <int> <int>
## 1:     1     4    10     1
## 2:     2     5    11     1
## 3:     3     6    12     1
```
Some text.

> 
> 
> proc.time()
   user  system elapsed 
   0.31    0.06    0.36