R has many in-built functions that are organized statements that work towards a specific task when fed with input as arguments. Let me explain how it all works in R. In R, a function is treated as an object, so, R interpreter will pass the control to this object or function along with the required inputs (arguments) to achieve the objective of the function. And once that has been achieved, the R interpreter retains the control with results if any, which might be stored in other objects. R is a very good programming language that has achieved a high status in the data science domain and is also deployed in numerous mission-critical business applications, all because of the valuable contributions made by the R community, which helped it evolve to newer levels.
If you are interested in learning R and acquiring certification, then have a look at Data Science Certification with R is a great course put out by Intellipaat. If you are just starting out in R, then checking out the R programming tutorial might be a good idea. Also, check out our YouTube video on R Programming Interview Questions.