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copied!<p><strong>Side Note</strong></p> <p>It is worth noting that <code>and</code> and <code>&&</code> are not equivalent.</p> <p><code>and</code> is a flow control operator while <code>&&</code> is a Boolean operator. What is the difference?</p> <p>One example of the differences, using <code>and</code>, you can assign values.</p> <pre><code>value = nil and value / 42 </code></pre> <p>This would fail if you tried it as below</p> <pre><code>value = nil && value / 42 </code></pre> <p><strong>Original Question 1</strong></p> <blockquote> <p>Assuming I want to evaluate one-liners with a return statement (similar to a certain > commonly used shell/bash expression), would this be a recommended way to do it, or is there > a more recommended approach?</p> </blockquote> <p>The way I have always seen this done in Ruby is this:</p> <pre><code>value if conditional </code></pre> <p>This will return the value if the conditional is met and <code>nil</code> otherwise. No need for the <code>return</code> statement if this is the last command in the function!</p> <p>If you are using this for an early exit to a function, I prefer using an <code>unless</code>. For instance...</p> <pre><code>return unless arguments_are_valid </code></pre> <p><strong>Original Question 2</strong></p> <blockquote> <p>foo method causes a syntax error. bar doesn't. Why?</p> </blockquote> <p>It's a matter of operator precedence. See the example below showing how they are evaluated.</p> <pre><code>(true && return) false (true) and (return false) </code></pre>

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