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Node.JS constant for platform-specific new line?
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230
Not sure if this is new in the 0.8.x but there is now a constant http://nodejs.org/api/os.html#o...
Ruby Regexp group matching, assign variables on 1 line
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201
You don't want scan for this, as it makes little sense. You can use String#match which will ret...
Gradle, “sourceCompatibility” vs “targetCompatibility”?
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answered May 21 '13 at 9:07
MattMatt
7,70133 gold badges2525 silver badges5555 bronze badges
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How do I test if a variable is a number in Bash?
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One approach is to use a regular expression, like so:
re='^[0-9]+$'
if ! [[ $yournumber =~ $re ]] ; then
echo "error: Not a number" >&2; exit 1
fi
If the value is not necessarily an integer, consider amending the regex appropriately; for instance:
^[0-9]+([.][0-9]+)?$
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In Hibernate Validator 4.1+, what is the difference between @NotNull, @NotEmpty, and @NotBlank?
...he CharSequence, Collection, Map or Array object is not null and size > 0.
@NotBlank: The string is not null and the trimmed length is greater than zero.
To help you understand, let's look into how these constraints are defined and carried out (I'm using version 4.1):
The @NotNull constrain...
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 does it mean in shell when we put a command inside dollar sign and parentheses: $(command)
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– Jonathan Leffler
Aug 1 '13 at 4:03
7
Technically, $(echo foo) creates a command substitution,...
Random Gaussian Variables
...rand = new Random(); //reuse this if you are generating many
double u1 = 1.0-rand.NextDouble(); //uniform(0,1] random doubles
double u2 = 1.0-rand.NextDouble();
double randStdNormal = Math.Sqrt(-2.0 * Math.Log(u1)) *
Math.Sin(2.0 * Math.PI * u2); //random normal(0,1)
double randNormal =...
git produces Gtk-WARNING: cannot open display
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edited Jun 27 '13 at 7:07
answered Apr 19 '13 at 12:19
J...
Sorting Python list based on the length of the string
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205
When you pass a lambda to sort, you need to return an integer, not a boolean. So your code sho...