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How to tell if node.js is installed or not
I've recently installed node.js and I have no idea how to run applications. I installed node.js but couldn't find further instructions. What does one really need to do? I wanted to see if it was actually working. So I executed a script called hello.js. It went as such:
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How to concatenate two strings in C++?
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First of all, don't use char* or char[N]. Use std::string, then everything else becomes so easy!
Examples,
std::string s = "Hello";
std::string greet = s + " World"; //concatenation easy!
Easy, isn't it?
Now if you need char con...
Giving a border to an HTML table row,
...or table. The net effect anyway is that you get separated border on almost all browsers unless you explicitly specifi collapse.)
Thus, you need to use collapsing borders. Example:
<style>
table { border-collapse: collapse; }
tr:nth-child(3) { border: solid thin; }
</style>
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Accessing constructor of an anonymous class
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How would I be able to call a method in the superclass of Test from within println, when that method is overridden?
– Mark Jeronimus
Feb 25 '14 at 14:56
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How do I use ROW_NUMBER()?
...ases, despite their name, don't have a formal ordering, so if you want to call a row "1" or "10" or "1337", you need to order them first using an ORDER BY clause, which is the one that goes in the OVER (ORDER BY X) clause.
– Wtrmute
Sep 13 '17 at 0:25
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What is the error “Every derived table must have its own alias” in MySQL?
...hout their names (or aliases) so, you must give unique names (aliases) for all of your sub-queries to make dbms query engine make it's work properly."
– Bahadir Tasdemir
Apr 25 '16 at 7:33
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Get list of a class' instance methods
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You actually want TestClass.instance_methods, unless you're interested in what TestClass itself can do.
class TestClass
def method1
end
def method2
end
def method3
end
end
TestClass.methods.grep(/method1/) # => []
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Purpose of returning by const value? [duplicate]
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In the hypothetical situation where you could perform a potentially expensive non-const operation on an object, returning by const-value prevents you from accidentally calling this operation on a temporary. Imagine that + returned a non-const value, and you could write:
(a + b).expensiv...
Import error: No module name urllib2
...ython 3 named urllib.request and urllib.error. The 2to3 tool will automatically adapt imports when converting your sources to Python 3.
So you should instead be saying
from urllib.request import urlopen
html = urlopen("http://www.google.com/").read()
print(html)
Your current, now-edited code sa...
How can I check if a scrollbar is visible?
...s been shrunk by the horizontal scroll bar height.
– Ally
Jul 3 '12 at 10:36
why you have defined same function two ti...