R 4.5 - Make a Returned Result Invisible and Build Recursive Functions

Use the invisible() function in place of return() in a function to prevent the output from printing to the user's screen but still allow the result to be stored into an R object. Additionally, when building a recursive function, use the Recall() function.

[douglasm]

Noticed the ifelse() on a single value, however, he is very clear on the use of invisible() versus return() and cautions the use of invisible(). Then nicely clarified the use of Recall() for recursive functions.

[Tanukosauro]

Best explanation on recursion in R.
Thank you :)

[MartinMaechler]

aargh: another "misuse" of ifelse() :

He has ifelse(x > 1, Recall(log(x)), x)
in a situation where he only speaks of x of length one.
In such a situation,
if(x > 1) Recall(log(x)) else x
is much more efficient and clearly preferred to the ifelse(., ., .) call.

[Ilyak]

Memoisation should go along with recursion IMO.

[shanjafri]

You should speak up a bit or get closer to the mic.