Recently on twitter - the source of most of these posts - Jenny Bryan (@JennyBryan) posted a link to her slides from her talk she gave in Auckland (http://bit.ly/jenny-nz). It inpsired threats of arson for people that use
setwd("/absolute/path/to/file") (this was because it reduces portability and outside of you using it the chances of someone having the exact directory setup is basically 0%)
and
rm(list = ls()) (because it interferes with peoples sessions and doesn’t sort out other session issues such as packages already loaded)
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