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Javascript shorthand ternary operator
... startingNumber || 1;
Something like that what you're looking for, where it defaults if undefined?
var foo = bar || 1; // 1
var bar = 2;
foo = bar || 1; // 2
By the way, this works for a lot of scenarios, including objects:
var foo = bar || {}; // secure an object is assigned when bar is a...
C++11 rvalues and move semantics confusion (return statement)
... returns a temporary which is caught by rval_ref. That temporary will have its life extended beyond the rval_ref definition and you can use it as if you had caught it by value. This is very similar to the following:
const std::vector<int>& rval_ref = return_vector();
except that in my re...
What's the idiomatic syntax for prepending to a short python list?
...
The s.insert(0, x) form is the most common.
Whenever you see it though, it may be time to consider using a collections.deque instead of a list.
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How do I append one string to another in Python?
...e.g.
s = ""
for i in range(n):
s+=str(i)
used to be O(n^2), but now it is O(n).
From the source (bytesobject.c):
void
PyBytes_ConcatAndDel(register PyObject **pv, register PyObject *w)
{
PyBytes_Concat(pv, w);
Py_XDECREF(w);
}
/* The following function breaks the notion that strin...
event.preventDefault() function not working in IE
...f(event.preventDefault) event.preventDefault();
You can combine the two with:
event.preventDefault ? event.preventDefault() : (event.returnValue = false);
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How to redirect to previous page in Ruby On Rails?
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In your edit action, store the requesting url in the session hash, which is available across multiple requests:
session[:return_to] ||= request.referer
Then redirect to it in your update action, after a successful save:
redirect_to...
How do I resolve ClassNotFoundException?
...ronments. We could say that all any program ever does is resolve such definitions... the question is always what/where is the definition and which version did you mean?
– masterxilo
Nov 23 '18 at 22:44
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What can I do to resolve a “Row not found or changed” Exception in LINQ to SQL on a SQL Server Compa
When executing SubmitChanges to the DataContext after updating a couple properties with a LINQ to SQL connection (against SQL Server Compact Edition) I get a "Row not found or changed." ChangeConflictException.
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Maximum and Minimum values for ints
..., which is the maximum value representable by a signed word. Equivalently, it's the size of the largest possible list or in-memory sequence.
Generally, the maximum value representable by an unsigned word will be sys.maxsize * 2 + 1, and the number of bits in a word will be math.log2(sys.maxsize * 2...
Location of parenthesis for auto-executing anonymous JavaScript functions?
I was recently comparing the current version of json2.js with the version I had in my project and noticed a difference in how the function expression was created and self executed.
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