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<h1 id="label-Precedence">Precedence</h1>
<p>From highest to lowest, this is the precedence table for ruby. High precedence operations happen before low precedence operations.</p>
<pre class="code ruby"><code class="ruby">!, ~, unary +
**
unary -
*, /, %
+, -
<<, >>
&
|, ^
>, >=, <, <=
<=>, ==, ===, !=, =~, !~
&&
||
#.., ...
?, :
modifier-rescue
=, +=, -=, etc.
defined?
not
or, and
modifier-if, modifier-unless, modifier-while, modifier-until
{ } blocks</code></pre>
<p>Unary <code>+</code> and unary <code>-</code> are for <code>+1</code>, <code>-1</code> or <code>-(a + b)</code>.</p>
<p>Modifier-if, modifier-unless, etc. are for the modifier versions of those keywords. For example, this is a modifier-unless expression:</p>
<pre class="code ruby"><code class="ruby"><span class='id identifier rubyid_a'>a</span> <span class='op'>+=</span> <span class='int'>1</span> <span class='kw'>unless</span> <span class='id identifier rubyid_a'>a</span>.<span class='id identifier rubyid_zero?'>zero?</span></code></pre>
<p><code>{ ... }</code> blocks have priority below all listed operations, but <code>do ... end</code> blocks have lower priority.</p>
<p>All other words in the precedence table above are keywords.</p>
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