Get access to all lessons in this course.
-
Setup packages
- devtools and usethis
- Package names and authors
- Choose a license
- Setup git + GitHub
-
Write code
- Writing functions
- Adding functions to our package
- Using other packages
- Packages so good they get their own functions
- Organizing .R files
-
Document
- roxygen2: In-Line Documentation for R
- Argument descriptions and examples
- Helper functions
- Joining documentation
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Test
- Unit tests for R
- Organizing tests
- R CMD Check
- Types of Test Files
- Test Coverage
-
Teach
- Examples
- README
- Spellcheck
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Add data and files
- Store data and files
- Include data for tests and create RMarkdown templates
- Create other templates
- Launch and store Shiny apps
- Citations, ignoring files, and including add-ins
Package Development with R
Adding functions to our package
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This lesson is called Adding functions to our package, part of the Package Development with R course. This lesson is called Adding functions to our package, part of the Package Development with R course.
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Your Turn
Create a new file with use_r() called “db_con”
Put this function in the file and save it
Use load_all() to load the package function.
Run this code to make sure it works
use_r("db_con")
in R/db_con.R:
db_con <- function(dbname = "residents_per_sector") {
dbname <- match.arg(dbname)
# We'll pretend we've connected to a database
# and just return some hard-coded data instead.
data.frame(
sector = as.factor(1:8),
residents = c(1000, 2034, 4594, 2304, 8093, 1200, 300, 2398))
}
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