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Update multiple rows in same query using PostgreSQL
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+50
You can also use update ... from syntax and use a mapping table. If you want to update more than one column, it's much more generaliza...
What do all of Scala's symbolic operators mean?
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530
I divide the operators, for the purpose of teaching, into four categories:
Keywords/reserved s...
Generate a random number in the range 1 - 10
...way to tell pg's random() function to get me only numbers between 1 and 10?
7 Answers
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What do numbers using 0x notation mean?
What does a 0x prefix on a number mean?
5 Answers
5
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JavaScript exponents
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answered Nov 18 '15 at 20:04
Salvador DaliSalvador Dali
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Converting an integer to a hexadecimal string in Ruby
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You can give to_s a base other than 10:
10.to_s(16) #=> "a"
Note that in ruby 2.4 FixNum and BigNum were unified in the Integer class.
If you are using an older ruby check the documentation of FixNum#to_s and BigNum#to_s
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How to increment a pointer address and pointer's value?
...else?
– felipemaia
Nov 21 '11 at 15:03
@Lundin Hi, is the answer above corrected now? Thanks.
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How to get an enum which is created in attrs.xml in code
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101
There does not seem to be an automated way to get a Java enum from an attribute enum - in Java ...
How can I loop through a List and grab each item?
...reach:
foreach (var money in myMoney) {
Console.WriteLine("Amount is {0} and type is {1}", money.amount, money.type);
}
MSDN Link
Alternatively, because it is a List<T>.. which implements an indexer method [], you can use a normal for loop as well.. although its less readble (IMO):
fo...
Find the extension of a filename in Ruby
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That's really basic stuff:
irb(main):002:0> accepted_formats = [".txt", ".pdf"]
=> [".txt", ".pdf"]
irb(main):003:0> File.extname("example.pdf") # get the extension
=> ".pdf"
irb(main):004:0> accepted_formats.include? File.extname("example.pdf")
=...