Printf example in bash does not create a newline

Question

Working with printf in a bash script, adding no spaces after \"\\n\" does not create a newline, whereas adding a space creates a newline, e. g.:

Answer 1

$ printf -v NewLine "\n"
$ echo -e "Firstline${NewLine}Lastline"

Firstline
Lastline

$ echo "Firstline${NewLine}Lastline"
Firstline
Lastline