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rails 3 validation on uniqueness on multiple attributes
I use Rails 3.0.0.beta4
3 Answers
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How to use the 'sweep' function
...o the 2nd, etc. of the matrix you defined, you will do:
sweep (M, 1, c(1: 4), "+")
I frankly did not understand the definition in the R documentation either, I just learned by looking up examples.
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Get all column names of a DataTable into string array using (LINQ/Predicate)
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4 Answers
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rspec 3 - stub a class method
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answered Jul 31 '14 at 18:49
Arup RakshitArup Rakshit
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adding directory to sys.path /PYTHONPATH
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answered Apr 19 '13 at 22:49
Ned DeilyNed Deily
75.4k1515 gold badges119119 silver badges147147 bronze badges
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How to get the title of HTML page with JavaScript?
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344
Use document.title:
console.log(document.title)
<title>Title test</title>
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Int to Char in C#
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141
(char)myint;
for example:
Console.WriteLine("(char)122 is {0}", (char)122);
yields:
(c...
Why in Java 8 split sometimes removes empty strings at start of result array?
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The behavior of String.split (which calls Pattern.split) changes between Java 7 and Java 8.
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Are “elseif” and “else if” completely synonymous?
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edited Sep 7 '10 at 20:40
answered Sep 7 '10 at 20:25
Da...
Split a string on whitespace in Go?
Given an input string such as " word1 word2 word3 word4 " , what would be the best approach to split this as an array of strings in Go? Note that there can be any number of spaces or unicode-spacing characters between each word.
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