When managing project timelines, you often receive dates as character strings that must be converted to proper date objects and formatted for clear reporting. This is a common task in project management, where consistency and readability of date formats are crucial for communication. In this challenge, you will work with a vector of character dates representing project milestones. Your goal is to convert these strings into `Date` objects and then format them in a style suitable for a client-facing timeline: `"Month Day, Year"` (such as `"March 5, 2023"`).


library(testthat)

source("user_code.R")
test_that("output is character vector of same length as input", {
  input <- c("2023-03-05", "2023-06-15", "2023-09-30")
  output <- convert_and_format_dates(input)
  expect_equal(length(output), length(input),
               info = "Output vector should have the same length as input.")
  expect_equal(typeof(output), "character",
               info = "Output should be a character vector.")
})

test_that("output is formatted as 'Month Day, Year'", {
  input <- c("2023-03-05", "2023-06-15", "2023-09-30")
  output <- convert_and_format_dates(input)
  expect_equal(output[1], "March 5, 2023",
               info = "First date should be formatted as 'March 5, 2023'.")
  expect_equal(output[2], "June 15, 2023",
               info = "Second date should be formatted as 'June 15, 2023'.")
  expect_equal(output[3], "September 30, 2023",
               info = "Third date should be formatted as 'September 30, 2023'.")
})

test_that("handles multiple date strings", {
  input <- c("2022-01-01", "2022-12-31", "2023-07-04")
  output <- convert_and_format_dates(input)
  expect_equal(output, c("January 1, 2022", "December 31, 2022", "July 4, 2023"),
               info = "Should correctly process multiple dates including different years.")
})

test_that("handles dates at beginning and end of year", {
  input <- c("2022-01-01", "2022-12-31")
  output <- convert_and_format_dates(input)
  expect_equal(output[1], "January 1, 2022",
               info = "Should correctly format beginning of year date.")
  expect_equal(output[2], "December 31, 2022",
               info = "Should correctly format end of year date.")
})

test_main.R

Master the essentials of handling text, dates, and files in R. This course guides you through string manipulation, regular expressions, date-time operations, and file I/O, with engaging explanations and practical challenges for beginners.

Learn to work with text data in R, from basic string operations to cleaning messy data using regular expressions.

Master handling dates and times in R, from parsing and formatting to performing calculations and managing time zones.

Learn to import and export data in R, working with CSV, Excel, and TXT files, and applying best practices for file I/O.

Challenge: Convert and Format Dates

Lösning

Challenge: Convert and Format Dates

Lösning