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    <p>You posted the oneliner:</p> <pre><code>@sentence = @sentence.split(' ').map!{|x| x = x[0..0].upcase &lt;&lt; x[1..-1] }.join(' ') </code></pre> <p>But you misunderstand a couple things about Ruby.</p> <p>First off, saying <code>x=</code> in a map call doesn't affect anything outside of the map call. The new value of that array element is the value <em>returned</em> by the block.</p> <p>Secondly, you don't need to mutate the first string with <code>&lt;&lt;</code> -- a concatenation that creates a new string (using <code>+</code>) is a much better option.</p> <p>Thirdly, <code>map!</code> makes changes directly to the array returned by <code>split</code>. What you want to do is leave that array untouched (even though it doesn't change program semantics), and return a new array with the mapped results, by using <code>map</code>.</p> <p>So you should have written:</p> <pre><code>@sentence = @sentence.split(' ').map{|x| x[0..0].upcase + x[1..-1] }.join(' ') </code></pre> <p>Now the statement <code>x[0..0].upcase + x[1..-1]</code> is still very obtuse. Maybe you should replace it with the <code>capitalize</code> method, which already changes the first letter of the string to uppercase. (Note that it also downcases all of the others, which may or may not be what you want.)</p> <pre><code>@sentence = @sentence.split(' ').map{|x| x.capitalize }.join(' ') </code></pre> <p>I'd probably use <code>gsub!</code> to change parts of the string in-place, but that's probably a little obtuse:</p> <pre><code>@sentence.gsub!(/\S+/){|x| x.capitalize} </code></pre> <p>One more thing. If the only purpose of a block is to call a single method on the object passed to the block, you can do the following:</p> <pre><code>@sentence = @sentence.split(' ').map(&amp;:capitalize).join(' ') </code></pre> <p>or to modify my <code>gsub!</code> version:</p> <pre><code>@sentence.gsub!(/\S+/,&amp;:capitalize) </code></pre>
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    1. POElegant Ruby one liners
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    1. USJoe Flynn
    1. USKen Bloom
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    1. POElegant Ruby one liners
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      1. VTUpMod
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    1. COJust now, you've either completely shattered his spirit, or he has absolutely tripled his excitement for one-liners.
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      1. USStéphan Kochen
    2. COI was hoping to learn a lot from the responses here, and Ken's comment has been a perfect educational journey! Definitely x3'd the one liner excitement
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      1. USkez
    3. CO+1 `@sentence = @sentence.split(' ').map(&:capitalize).join(' ')` is what I'd call elegant.
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      1. USthe Tin Man
 

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