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PORotate an array using LINQ syntax
 

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  1. PORotate an array using LINQ syntax
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    <p>I am solving this problem of rotating an array and got algorithm and code working</p> <pre><code> int[] Rotate(int[] ar,int k) { if (k &lt;= 0 || k &gt; ar.Length - 1) return ar; Reverse(ar, 0, k - 1); Reverse(ar, k, ar.Length - 1); Reverse(ar, 0, ar.Length - 1); return ar; } void Reverse(int[] ar,int start, int end) { while (start &lt; end) { int temp = ar[start]; ar[start] = ar[end]; ar[end] = temp; start++; end--; } } </code></pre> <p>Now I want to do this in LINQ and I got the below code, I think this can be done much better. </p> <pre><code> int[] Rotate(int[] ar,int k) { if (k &lt;= 0 || k &gt; ar.Length - 1) return ar; int[] ar1=ar.Take(k-1).Reverse().ToArray(); int[] ar2=ar.Skip(k - 1).Take(ar.Length - k+1).Reverse().ToArray(); int[] ar3 = ar1.Concat(ar2).Reverse().ToArray(); return ar3; } </code></pre> <p>This is a well known algorithm from Programming pearls - <a href="http://books.google.com/books?id=kse_7qbWbjsC&amp;lpg=PA14&amp;ots=DfzTzQCSar&amp;dq=rotate%20an%20array%20programming%20pearls&amp;pg=PA14#v=onepage&amp;q&amp;f=false" rel="nofollow noreferrer">http://books.google.com/books?id=kse_7qbWbjsC&amp;lpg=PA14&amp;ots=DfzTzQCSar&amp;dq=rotate%20an%20array%20programming%20pearls&amp;pg=PA14#v=onepage&amp;q&amp;f=false</a></p> <p>And in general how to develop my LINQ skills, if I am given a programming problem, right now I am only thinking in for loops or foreach loops, how to think in terms of linq operators. I am reading C# 4.0 nutshell, other than practicing any advice? </p>
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    1. USsatyajit
    1. USsatyajit
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    1. COThis is *extension method* syntax. LINQ syntax would start with `from ...`.
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      1. USMarcelo Cantos
    2. COYes, but using LINQ to refer to lambdas/Enumerable...I fear that cat is well out of the bag. :(
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      1. USKirk Woll
    3. CO@Marcelo Cantos, what you're referring to is called the *query comprehension syntax*. There is no such thing as "LINQ syntax".
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      1. USThomas Levesque
 

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