Expressions are evaluated to perform calculations which may assign values to variables or pass arguments to functions.

The values can easily be assigned to a variable.  For example:

> x = 7

> print(x)

7

 

> x = 7

> y = x   //Value of x is assigned to y

> print(y)

7

Operators precedence of 'and' and 'or'
 
The precedence of the 'and' operator is higher than the 'or' operator.
 
For example, X || Y && Z will be evaluated as X||(Y&&Z).
 
To avoid confusion, using parentheses is recommended for complex expressions.