hook_benchmark adds the benchmark feature to chunks. To benchmark a chunk, specifying
benchmark=TRUE as a chunk option.
# benchmark=TRUE is specified as a chunk option
#>  5050
As the above result shows, output format contains chunk label. I recommend specifying chunk options explicitly. Note that this function is experimental, and format may change in the future.
If you do not like the default formatting, you may provide original function to the
format argument. The function takes a result of a benchmark in seconds as the first argument, and a list of current chunk options as the second argument. The example below shows the benchmark result as is. Make sure the formatting function returns a string.
hook_benchmark(format = function(x, options) as.character(x))
#>  5050
Insert results in body text
If you need to insert the result with the text, use
chunkhooks::benchmarks environment. This environment records all the benchmark results in seconds. You can extract a result by specifying a chunk label.
r benchmarks$bench1 gives 0.004.