# NOT RUN {
words <- strsplit("Hello wOrld", " ")[[1]]
cat(paste(toupper(words), collapse=" "), "\n") # "HELLO WORLD"
cat(paste(tolower(words), collapse=" "), "\n") # "hello world"
cat(paste(capitalize(words), collapse=" "), "\n") # "Hello WOrld"
cat(paste(decapitalize(words), collapse=" "), "\n") # "hello wOrld"
# Sanity checks
stopifnot(paste(toupper(words), collapse=" ") == "HELLO WORLD")
stopifnot(paste(tolower(words), collapse=" ") == "hello world")
stopifnot(paste(capitalize(words), collapse=" ") == "Hello WOrld")
stopifnot(paste(decapitalize(words), collapse=" ") == "hello wOrld")
# }
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