What's the precedence of ruby's method call

Question

http://phrogz.net/programmingruby/language.html#table_18.4 The table provided by the link above only gives the precedence of ruby's operators. What's the precedence of a method(or should I say: a message/ function) ?

For example, when I input something as below in irb

Math.sqrt 2 + 2

I got 2.0 as the result. Without the definite rules of the precedence, I just can't decide where to use the parens and where to omit them. So, someone please help me get rid of this uncertainty. Thanks in advance!

Answer 1

Any operator has precedence over the method call. It is highly recommended to use () for method calls to avoid situations like the one you're asking about.