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How to test if parameters exist in rails
I'm using an IF statement in Ruby on Rails to try and test if request parameters are set. Regardless of whether or not both parameters are set, the first part of the following if block gets triggered. How can I make this part ONLY get triggered if both params[:one] and params[:two] is set?
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Literal notation for Dictionary in C#?
I currently have a WebSocket between JavaScript and a server programmed in C#. In JavaScript, I can pass data easily using an associative array:
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Warning the user/local/mysql/data directory is not owned by the mysql user
I can't start the mysql service in Snow Leopard, and in the panel prefs appears the message,
2 Answers
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Ways to iterate over a list in Java
...ones) that one might iterate through a list (or perhaps other collections) and the advantages or disadvantages of each.
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What does an underscore in front of an import statement mean?
...river{})
Once it's registered in this way, sqlite3 can be used with the standard library's sql interface in your code like in the example:
db, err := sql.Open("sqlite3", "./foo.db")
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PHP - Get bool to echo false when false
...ed Feb 9 '11 at 18:05
Dan GrossmanDan Grossman
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Format Float to n decimal places
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You may also pass the float value, and use:
String.format("%.2f", floatValue);
Documentation
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The opposite of Intersect()
...rray2.Except(array1);
If you want the real non-intersection (also both 1 and 4), then this should do the trick:
var nonintersect = array1.Except(array2).Union( array2.Except(array1));
This will not be the most performant solution, but for small lists it should work just fine.
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Modulo operator with negative values [duplicate]
...rom ISO14882:2011(e) 5.6-4:
The binary / operator yields the quotient, and the binary % operator
yields the remainder from the division of the first expression by the
second. If the second operand of / or % is zero the behavior is
undefined. For integral operands the / operator yields the ...
push multiple elements to array
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This answer and the selected answer produce different, and perhaps unexpected, results. a.push(1) vs. a.push([1])
– oevna
Dec 24 '16 at 1:12
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