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    <p>In Ruby any operator has precedence over method calls, e.g. operators are evaluated first.</p> <p>However the example <code>Math.sqrt 2 + 2</code> is a good illustration on how hard to read and unintuitive it can be to leave out parentheses. One might expect <code>Math.sqrt(2) + 2</code> to be evaluated here. </p> <p>When you come across a line like this, you might think: What did the coder intend? Is this a bug?</p> <p>It is always a good idea to use parentheses whenever you can, to make clear what you want, especially when there is a method call or multiple operators - it's just good style, and the lowest risk approach (e.g. don't make assumptions, but make yourself clear by using parentheses).</p> <p>It never hurts to add extra parentheses in expressions, but leaving them out can hurt quite a bit. </p> <p>Here's a nice example which I recently came across:</p> <pre><code> def foo(arg) raise "error" end x = foo 4 rescue 7 x =&gt; nil # oops! x = foo(4) rescue 7 x =&gt; 7 </code></pre> <p>I hope this nicely illustrates why it's important to use parentheses</p> <p><strong>Also:</strong></p> <p>Check here, under "Calling a Method" : <a href="http://ruby-doc.org/docs/ProgrammingRuby/html/tut_methods.html" rel="nofollow">http://ruby-doc.org/docs/ProgrammingRuby/html/tut_methods.html</a> Quote:</p> <blockquote> <p>[...] If there is no ambiguity you can omit the parentheses around the argument list when calling a method.[...] <strong>However, except in the simplest cases we don't recommend this</strong>---there are some subtle problems that can trip you up.[In particular, you must use parentheses on a method call that is itself a parameter to another method call (unless it is the last parameter).] <strong>Our rule is simple: if there's any doubt, use parentheses.</strong></p> </blockquote> <p>See also: <a href="http://phrogz.net/programmingruby/language.html" rel="nofollow">http://phrogz.net/programmingruby/language.html</a></p>
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    1. POWhat's the precedence of ruby's method call
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    1. CO@Tile, could I get some direct answers, plz?
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    2. CO@Need4Steed I think he is right - you should just google it - it doesn't seem like you researched the question yourself at all
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    3. COI don't see any trolling, and I checked the edits. This answer was helpful.
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