Replace deprecated case_match() with replace_values()

[jt14den]

Closes #152.

nickyjgarland flagged on #149 that case_match() (used to replace the superseded recode()) has itself since been deprecated in dplyr 1.2.0, in favor of recode_values()/replace_values().

All 6 call sites in episodes/03-data-cleaning-and-transformation.Rmd and episodes/05-reproducible-reports.Rmd used .default = <same column> (i.e. "keep unmatched values as-is"), which is exactly replace_values()'s built-in behavior, so this converts each case_match(x, ..., .default = x) call to replace_values(x, ...), dropping the now-unneeded .default argument. Also updated the objectives, function-list bullet, keypoints, and the prose paragraph explaining .default (rewritten to explain why replace_values() doesn't need it).

Verified against real dplyr 1.2.1: old case_match() vs. new replace_values() produce identical() output on both synthetic data (with an unmatched value and an NA) and the real 10,000-row books.csv for both subCollection and format.

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/LibraryCarpentry/lc-r/compare/md-outputs..md-outputs-PR-153

The following changes were observed in the rendered markdown documents:

 01-intro-to-r.md                                   |   10 +-
 02-starting-with-data.md                           |    2 +-
 03-data-cleaning-and-transformation.md             |  160 +-
 04-data-viz-ggplot.md                              |   18 +-
 05-reproducible-reports.md                         |    6 +-
 config.yaml (gone)                                 |   86 -
 ...t-rendered-boxplot-exercise-subcollection-1.png |  Bin 49562 -> 49553 bytes
 ...a-viz-ggplot-rendered-boxplot-with-points-1.png |  Bin 42909 -> 42752 bytes
 ...data-viz-ggplot-rendered-unnamed-chunk-14-1.png |  Bin 39625 -> 38789 bytes
 fig/04-data-viz-ggplot-rendered-violin-plot-1.png  |  Bin 38570 -> 38794 bytes
 ...oducible-reports-rendered-plot-high-usage-1.png |  Bin 46952 -> 46985 bytes
 md5sum.txt                                         |   32 +-
 renv.lock (gone)                                   | 3962 --------------------
 13 files changed, 116 insertions(+), 4160 deletions(-)

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⏱️ Updated at 2026-08-23 02:01:26 +0000