Empty a file using command

First off, this isn't the only method to achieve the outcome of emptying a file.

Using a symbol : is a shell built-in command that is essence equivalent to the true command and it can be used as a no-op (no operation).  It can be used as follows:

# : > filename.txt

OR 

# true > filename.txt

My initial file was as follows:

21548342 16 Mar 20:27 code.log

Post using the command 

: > filename.txt

The response was 

0 16 Mar 20:27 code.log