What code allows ruby to automatically close files?

Answer 1

F = File.open("Example.txt",'w+')
f.puts "String of text"
f.close

you don't need f.close the file automatically closes when you terminate the program or open/create a new file

Answer 2

f = File.open("file.txt"), 'w+') {
|file| file.puts "some text"
}

this method automatically closes the file after writing to it.