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14248518
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2013-01-09T23:45:53.093
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2015-10-12T14:05:19.160
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2015-10-12T14:05:19.160
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<code>String#slice!</code> and <code>String#insert</code> is going to get you much closer to what you want without converting your strings to arrays. For example, to simulate <code>Array#pop</code> you can do: <pre><code>text = '¡Exclamation!' mark = text.slice! -1 mark == '!' #=> true text #=> "¡Exclamation" </code></pre> Likewise, for <code>Array#shift</code>: <pre><code>text = "¡Exclamation!" inverted_mark = text.slice! 0 inverted_mark == '¡' #=> true text #=> "Exclamation!" </code></pre> Naturally, to do an <code>Array#push</code> you just use one of the concatenation methods: <pre><code>text = 'Hello' text << '!' #=> "Hello!" text.concat '!' #=> "Hello!!" </code></pre> To simulate <code>Array#unshift</code> you use <code>String#insert</code> instead, it's a lot like the inverse of slice really: <pre><code>text = 'World!' text.insert 0, 'Hello, ' #=> "Hello, World!" </code></pre> You can also grab chunks from the middle of a string in multiple ways with slice. First you can pass a start position and length: <pre><code>text = 'Something!' thing = text.slice 4, 5 </code></pre> And you can also pass a Range object to grab absolute positions: <pre><code>text = 'This is only a test.' only = text.slice (8..11) </code></pre> In Ruby 1.9 using <code>String#slice</code> like this is identical to <code>String#[]</code>, but if you use the bang method <code>String#slice!</code> it will actually remove the substring you specify. <pre><code>text = 'This is only a test.' only = text.slice! (8..12) text == 'This is a test.' #=> true </code></pre> Here's a slightly more complex example where we reimplement a simple version of <code>String#gsub!</code> to do a search and replace: <pre><code>text = 'This is only a test.' search = 'only' replace = 'not' index = text =~ /#{search}/ text.slice! index, search.length text.insert index, replace text == 'This is not a test.' #=> true </code></pre> Of course 99.999% of the time, you're going to want to use the aforementioned <code>String.gsub!</code> which will do the exact same thing: <pre><code>text = 'This is only a test.' text.gsub! 'only', 'not' text == 'This is not a test.' #=> true </code></pre> references: <ul> <li><a href="http://rubydoc.info/stdlib/core/String" rel="nofollow">Ruby String Documentation</a></li> </ul>
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1. PORuby: String no longer mixes in Enumerable in 1.9
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1. USAnthony Michael Cook
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