R Programming Language Certification Technology & Digital Applications 3

Question 1

In R, which package allows you to create interactive, browser-based visualizations using the Plotly JavaScript library?

Accepted Answer

plotly

Answer

The plotly R package wraps the Plotly.js library, enabling creation of interactive charts that support hover tooltips, zooming, and panning in a web browser.

Question 2

What does `Sys.getenv('HOME')` return in R?

Accepted Answer

The value of the HOME environment variable

Answer

`Sys.getenv()` retrieves the value of system environment variables; 'HOME' typically returns the path to the user's home directory.

Question 3

Which R function writes an object to a connection using the native R binary format, preserving exact object structure?

Accepted Answer

saveRDS()

Answer

`saveRDS()` serializes a single R object to a file in a binary format that can be restored with `readRDS()`, preserving the object's class and attributes.

Question 4

In R Markdown, which output format produces a standalone HTML file with interactive widgets?

Accepted Answer

html_document

Answer

`html_document` output in R Markdown produces a self-contained HTML file that can embed htmlwidgets and interactive elements viewable in any browser.

Question 5

What is the purpose of `tryCatch()` in R when building robust data pipelines?

Accepted Answer

It handles errors and exceptions gracefully without stopping execution

Answer

`tryCatch()` allows you to intercept errors, warnings, and messages during execution and respond with custom logic instead of halting the script.

R Programming Language Certification Practice Test

R Programming Language Certification Practice Test

R Programming Language Certification Technology & Digital Applications 3