# A little R prank

[This article was first published on

Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.

**R – insightR**, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here)Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.

**By Gabriel Vasconcelos**

## R functions

The book Advanced R, by Hadley Wickham, shows a very interesting statement:

“To understand R, two slogans are Helpful:

- Everything that exists in an object.
- Everything that happens is a function call.”

– John Chambers

In other words, every action is caused by a function, and functions are things you can change. `[`

, `(`

and `+`

are all functions. That means you can call these actions as functions.

> a=1:10 > #Two equivalent codes > `[`(a,4) [1] 4 > a[4] [1] 4 > #Other two equivalent codes > `+`(3,7) [1] 10 > 3+7 [1] 10

## Just a little prank

Imagine you want to do a little prank with your friend who left his R oppened in the office. You could change the `+`

function like in the code below and see the magic happens.

> `+`=function(x,y)x-y > 1+1 [1] 0

## More information on R functions

[1] Wickham, Hadley. Advanced R. CRC Press, 2014.

To

**leave a comment**for the author, please follow the link and comment on their blog:**R – insightR**.R-bloggers.com offers

**daily e-mail updates**about R news and tutorials about learning R and many other topics. Click here if you're looking to post or find an R/data-science job.

Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.