a && b
a and b
a or b
a || b
a + b
# a - b
a << b
a >> b

a | b
a & b
a ^ b

a == b
a != b
a === b
a <=> b
a =~ b
a !~ b

a < b
a <= b
a > b
a >= b

# a * b
a / b
a % b
a ** b