if statement one-liner bash

How to write a one liner if statement in Bash. Although I think code should be clear and easy to follow by anyone who reads it. however, I also love the simplicity and my code as short as possible, if statement that usually tends to be long, can also be one line in Bash

1. Simple do one command if true
 [ $arg -gt 10 ] && echo "$arg bigger is than 10" 

2. Run multiple commands

[  $arg -lt 10 ] && { date; echo "$arg smaller than 10"; }    

3. If true run one command else run another

[  $arg -gt 10 ] && echo Big || echo Small