Parentheses and operator precedence

In general an expression may be enclosed in parentheses without changing its meaning.

If parentheses are not used, operator precedence follows the sequence below, starting with the operators that bind most tightly. Within each group the operators are evaluated left-to-right

Operator	Meaning
[]	predicate
/, //	path operator
unary -, unary +	unary plus and minus
cast as	dynamic type conversion
castable as	type test
treat as	static type conversion
instance of	type test
except, intersect	set difference and intersection
\|, union	union operation on sets
*, div, idiv, mod	multiply, divide, integer divide, modulo
+, -	plus, minus
to	range expression
=, !=, is, <, <=;, >, >=, eq, ne, lt, le, gt, ge	comparisons
and	Boolean and
or	Boolean or
if	conditional expressions
some, every	quantified expressions
for	iteration (mapping) over a sequence
, (comma)	Sequence concatenation

The various operators are described, in roughly the above order, in the sections that follow.