Ruby Precedence

ruby-precedence.txt

N A M  Operator(s)            Description
- - -  -----------            -----------
1 R Y  ! ~ +                  boolean NOT, bitwise complement, unary plus
                              (unary plus may be redefined from Ruby 1.9 with +@)

2 R Y  **                     exponentiation
1 R Y  -                      unary minus (redefine with -@)

2 L Y  * / %                  multiplication, division, modulo (remainder)
2 L Y  + -                    addition (or concatenation), subtraction

2 L Y  << >>                  bitwise shift-left (or append), bitwise shift-right
2 L Y  &                      bitwise AND

2 L Y  | ^                    bitwise OR, bitwise XOR (exclusive OR)
2 L Y  < <= >= >              ordering

2 N Y  == === != =~ !~ <=>    equality, pattern matching, comparison
                              (!= and !~ may not be redefined prior to Ruby 1.9)

2 L N  &&                     boolean AND
2 L N  ||                     boolean OR

2 N N  .. ...                 range creation (inclusive and exclusive)
                              and boolean flip-flops

3 R N  ? :                    ternary if-then-else (conditional)
2 L N  rescue                 exception-handling modifier

2 R N  =                      assignment
2 R N  **= *= /= %= += -=     assignment
2 R N  <<= >>=                assignment
2 R N  &&= &= ||= |= ^=       assignment

1 N N  defined?               test variable definition and type
1 R N  not                    boolean NOT (low precedence)
2 L N  and or                 boolean AND, boolean OR (low precedence)
2 N N  if unless while until  conditional and loop modifiers