Order of Precedence
Order of operations, also called operator precedence, is a set of rules specifying which procedures should be performed first in a mathematical expression.
Precedence Overview
Precedence  Type of Operator  Examples 

11 
Nular operators (commands with no arguments):


10 
Unary operators (commands with 1 argument):


9  Hashselect operator  
8  Power operator  
7  
6  
5  N/A  
4 
Binary operators (commands with 2 arguments):


3  
2  Logical and operator  
1  Logical or operator 
Examples
Input  Process  Comment 

result equals 7, and not 9 (see also PEMDAS)  
sleep 10 will return Nothing, then + random 20 will be calculated but not used. 