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# Installing packages (run once; comment out afterwards)
# install.packages("dplyr")
# install.packages(c("ggplot2", "tidyr", "readr"))

# Loading packages
library(stats)    # ships with base R; loaded by default
# library(dplyr)  # would load dplyr if installed

# Inspect the current environment
ls()                     # list all objects in .GlobalEnv
x <- 10
y <- "test"
ls()                     # now shows "x" and "y"
exists("x")              # TRUE
exists("z")              # FALSE

# Remove objects
rm(y)
ls()                     # "y" is gone

# Working directory management
original_wd <- getwd()
cat("Working dir:", original_wd, "
")
# setwd("C:/my_project")   # change working directory

# Inspect a package's contents
# ls("package:stats")    # list exported names

# Session information (useful for reproducibility)
R.version.string         # e.g. "R version 4.3.1 (2023-06-16)"
Sys.time()               # current date-time
.Machine$integer.max     # 2147483647  — max integer value

# Saving / loading (workspace)
# save.image("session.RData")   # save entire workspace
# load("session.RData")         # restore workspace
# saveRDS(x, "x.rds")           # save a single object
# x <- readRDS("x.rds")         # restore a single object