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    <blockquote> <p>why do I get nil when I reverse the order of the words.first.capitalize and words.join(" ") lines?</p> </blockquote> <p>This is the reason:</p> <pre><code>"abb".capitalize # =&gt; "Abb" "Abb".capitalize! # =&gt; nil "Abb".capitalize # =&gt; "Abb" </code></pre> <p><a href="http://www.ruby-doc.org/core-2.0.0/String.html#method-i-capitalize-21" rel="nofollow"><strong><code>String.capitalize!</code></strong></a> says:</p> <blockquote> <p>Modifies str by converting the first character to uppercase and the remainder to lowercase. <strong><em>Returns nil if no changes are made</em></strong>. Note: case conversion is effective only in ASCII region.</p> </blockquote> <p>When you are putting the line <code>words.first.capitalize!</code> at the end of your method, the <code>String.capitalize!</code> tried to capitalize the word which is already capitalized. You are using the <code>bang(!)</code> version, so, as per the documentation, you are getting <code>nil</code>.</p> <p>One example:</p> <pre><code>def titleize(x) words = x.split(" ").collect do |word| if %w(the and of).include?(word) word else word.capitalize end end words.join(" ") words.first.capitalize! end titleize("he great book") # =&gt; nil </code></pre> <p>Probably your input string was not containing any of the words you listed here <code>%w(the and of)</code>, when you were testing. I would recommend you to use <a href="http://www.ruby-doc.org/core-2.0.0/String.html#method-i-capitalize" rel="nofollow"><strong><code>String#capitalize</code></strong></a> instead. </p>
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    1. POWhy do I get a nil after changing the order of two lines?
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    1. USthe Tin Man
    1. USArup Rakshit
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    1. POWhy do I get a nil after changing the order of two lines?
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    1. COIn English, we don't use `:-`. It's not a stylistic decision, it's proper punctuation to use `:` only, with no preceding space. Also, a space follows a comma in a sentence to delimit words, just as if there was no comma.
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    2. CO@theTinMan Thanks for correcting it. I am not that much of good in English! It is my third language :(
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