Precedence of Ruby operators

1. [ ] [ ]=
2. **
3. ! ~ + -
4. * / %
5. + -
6. >> <<
7. &
8. ^ |
9. <= < > >=
10. <=> == === != =~ !~
11. &&
12. ||
13. .. ...
14. ? :
15. = %= { /= -= += |= &= >>= <<= *= &&= ||= **=
16. defined?
17. not
18. or and
19. if unless while until
20. begin/end

For more information see Table 18.4 Show archive.org snapshot in The Pragmatic Programmer's Guide Show archive.org snapshot .