From highest to lowest, this is the precedence table for ruby. High precedence operations happen before low precedence operations.
!, ~, unary + ** unary - *, /, % +, - <<, >> & |, ^ >, >=, <, <= <=>, ==, ===, !=, =~, !~ && || .., ... ?, : modifier-rescue =, +=, -=, etc. defined? not or, and modifier-if, modifier-unless, modifier-while, modifier-until { } blocks
Unary +
and unary -
are for +1
, -1
or -(a + b)
.
Modifier-if, modifier-unless, etc. are for the modifier versions of those keywords. For example, this is a modifier-unless expression:
a += 1 unless a.zero?
{ ... }
blocks have priority below all listed operations, but do ... end
blocks have lower priority.
All other words in the precedence table above are keywords.