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How to check a not-defined variable in JavaScript
...-assignable was fixed in ECMAScript 5, which was released in 2009. You can now safely use === and !== to test for undefined without using typeof as undefined has been read-only for some time.
If you want to know if a member exists independent but don't care what its value is:
if ('membername' in o...
Overloading and overriding
... //wash the Truck
}
Wash function was only washing a Car before, but now its overloaded to wash a Truck as well.
If the provided input object is a Car, it will execute Wash(Car anyCar)
If the provided input object is a Truck, then it will execute
Wash(Truck anyTruck)
Let's override Wash()...
How do I remove/delete a folder that is not empty?
...
Anyone know why this functionality is not in the os package? Seems like os.rmdir is quite useless. Any good arguments for why it's implemented this way?
– Malcolm
Sep 24 '13 at 0:43
...
What's the most efficient way to test two integer ranges for overlap?
... is in both ranges, i.e.
x1 <= C <= x2
and
y1 <= C <= y2
Now, if we are allowed to assume that the ranges are well-formed (so that x1 <= x2 and y1 <= y2) then it is sufficient to test
x1 <= y2 && y1 <= x2
...
Regex lookahead, lookbehind and atomic groups
...ume any characters so that search for REGEX_2 starts at the same location. Now REGEX_2 makes sure that the string matches some other rules. Without look-ahead it would match strings of length three or five.
Negative lookahead
Syntax:
(?!REGEX_1)REGEX_2
Match only if REGEX_1 does not match; af...
How to check if object property exists with a variable holding the property name?
...otypeOf(yoshi, hattori);
if ("sneak" in yoshi)
console.log("Yoshi can now sneak");
if (!("creep" in hattori))
console.log("Hattori cannot creep");
Object.setPrototypeOf(hattori, kuma);
if ("creep" in hattori)
console.log("Hattori can now creep");
if ("creep" in yoshi)
console.log(...
WCF on IIS8; *.svc handler mapping doesn't work
...eck the box for "HTTP-Activation". You can also add non-http types if you know you need them (tcp, named pipes, etc).
Click "Install" Button.
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What does “1 line adds whitespace errors” mean when applying a patch?
...free to ignore the warning or turn it off with git config apply.whitespace nowarn.
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Remove all classes that begin with a certain string
...eral groups. Each group has a specific prefix. In the javascript, I don't know which class from the group is on the div. I want to be able to clear all classes with a given prefix and then add a new one. If I want to remove all of the classes that begin with "bg", how do I do that? Something like th...
In Android, how do I set margins in dp programmatically?
...arams. If you use relative layout, import LinearLayout.LayoutParams , etc.
Now, if you set the margin using Layout_marginLeft, Right, etc, you need to update margin in this way
layoutParams.setMargins(left, top, right, bottom);
If you set margin using the new layout_marginStart, you need to update ...