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Immutable vs Mutable types
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What? Floats are immutable? But can't I do
x = 5.0
x += 7.0
print x # 12.0
Doesn't that "mut" x?
Well you agree strings are immutable right? But you can do the same thing.
s = 'foo'
s += 'bar'
print s # foobar
The value of the variable changes, but it changes by chang...
Using C# reflection to call a constructor
...ic Addition(int a)
{
Console.WriteLine("Constructor called, a={0}", a);
}
}
class Test
{
static void Main()
{
Type type = typeof(Addition);
ConstructorInfo ctor = type.GetConstructor(new[] { typeof(int) });
object instance = ctor.Invoke(new object[] {...
How to write Unicode characters to the console?
...
203
It's likely that your output encoding is set to ASCII. Try using this before sending output:
C...
How to get numbers after decimal point?
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answered Mar 5 '12 at 5:02
lllluuukkelllluuukke
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How do I get a list of column names from a psycopg2 cursor?
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Jasmine.js comparing arrays
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edited May 16 '15 at 20:01
d-_-b
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answe...
Where is the syntax for TypeScript comments documented?
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edited Apr 27 '19 at 14:07
slideshowp2
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ans...
Getting attributes of Enum's value
...tribute), false);
var description = ((DescriptionAttribute)valueAttributes[0]).Description;
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How can javascript upload a blob?
...?
– William Entriken
Aug 7 '13 at 2:05
@FullDecent What do you mean? To prompt the user to download a file using the F...
How does grep run so fast?
...omparison
# (everything is in the buffer cache)
$ time grep -c 'tg=f_c' 20140910.log
28
0.168u 0.068s 0:00.26
$ time grep -c ' /cc/merchant.json tg=f_c' 20140910.log
28
0.100u 0.056s 0:00.17
The longer form is 35% faster!
How come? Boyer-Moore consructs a skip-forward table from the pattern-st...