I'm trying to implement a method to copy dungeons in a game managment app. Here is an example of a Dungeon to be copied: attributes: { isReady: true, isMainQuest: true, color: &quot;red&quot;, partyMax: 8 } id: 59272 gamerMax: 12 gameId: 3 advLeveling: true mainObjects: [0: &quot;Treasure&quot; 1: &quot;BossKill&quot;] stats: { monsterCount: 25, treasureCount: 50, bossCount: 15 }  After reading a lot of posts about Object.keys, I decided to use that to &quot;deep copy&quot; my dungeon. My latest interation simply looks like this: Object.keys(obj).forEach(function (prop) {         console.log(&quot;obj[prop]: &quot;, obj[prop]); }  But in all the versions I tried, including the one above, they never deep copy the nested arrays and objects like attributes, mainObjects, and stats. Is there a way to copy those as well, no matter how deep? Thanks!
What is the most efficient way to clone a JavaScript object? I've seen obj = eval(uneval(o)); being used, but . I've done things like obj = JSON.parse(JSON.stringify(o)); but question the efficiency.  I've also seen recursive copying functions with various flaws.  I'm surprised no canonical solution exists.
Can I visit other Schengen countries on a long-term Schengen visa or residency permit? Creating a byte array from a stream What is the prefered method for creating a byte array from an input stream?   Here is my current solution with .NET 3.5.   Stream s; byte[] b;  using (BinaryReader br = new BinaryReader(s)) {     b = br.ReadBytes((int)s.Length); }   Is it still a better idea to read and write chunks of the stream? Can I use my iPhone as a "remote" for my iPad? Live search through table rows In thinking how to ask this question (somewhat) succinctly, I keep coming back to a Microwave Oven.  A Microwave Oven has a grid of holes over the window specifically designed to be smaller in diameter than the wavelength of the microwaves it produces, yet larger than the wavelengths of the visible light spectrum - this is so you can watch your food being heated without getting an eye full of microwaves.  The "realness" of electromagnetic waves seems indisputable - both from the microwave example above, and also because if I want to broadcast a radio wave with a certain wavelength, then I need to make sure I have an antenna of corresponding length to produce the wave I'm looking for.  Furthermore, we discuss and treat these waves as real, measurable "objects" that exist and can be manipulated.     Now, if I want to describe the behavior of my Microwave Oven in the framework of QM (let's pretend my oven is going to only produce 1 photon of energy corresponding to a wavelength of the microwave spectrum for simplicity) then I'll describe the behavior of that photon as a wavefunction that evolves over time and gives a probability distribution within my microwave that similarly does not allow the photon to pass through the safety grid and exit the oven cavity giving me a retinal burn.  The difference is, the wavefunction is never treated as something "real" in this description.  When the safety grid is described as working to protect you because it has holes smaller than the wavelength of the classical waves it's blocking, this is a useful description that seems to describe "real" objects/be-ables.  While it is possible to describe why an individual photon has low probability of passing through the same grid but extended physical properties such as wavelength (in space) are treated as non-real because we're dealing with a point particle and with behavior described by something we also treat as non-real (the wavefunction); it seems unclear to me why we insist this wave function which predicts behavior of physical measurements so well is somehow "non-real."    Put another way, if we have no problem treating EM waves as "Real," then why do we insist on treating the wavefunction that describes the same behavior as "unreal?"  I understand there is recent research (Eric Cavalcanti and his group for one) trying to argue this point, but as every respectable physics professor, I've ever encountered, has treated the wavefunction as an indisputably non-real mathematical tool, I needed to ask this community for an answer. Multiple runnable classes inside JAR, how to run them? Why do I have blurred vision and how do I fix it? Is there a non written rule to which person to use in the PhD thesis, 5 years of using "We" in the papers have brought me to the innate necessity to do it every time I describe something.  Recently, though, one of my lab-mates told me that I should use I, since it is your work, if the thesis were co-written, then it would be a different story.  Is there any standard in your universities, or do you have any preferred practice. Interior of closure of open set in topological space If $U$ is an open set in a topological space, is it true that $U$ is the interior of the closure of itself?   If $U$ is open, it must be the interior of itself. But is it the interior of the closure of itself? In the closure, we include all points $x$ such that any open set containing $x$ also contains a point in $U$. In the interior of the closure, we take the union of all open sets contained in the closure. I'd like to write an N-body simulation in which I collide two disk galaxies. To give you an idea of the accuracy I'm trying to achieve, I'm aiming to make this my screensaver at 30fps on my work desktop. Think Euler's method, large epsilons in denominators to prevent blow up, all that lazy stuff.   One place I don't want to be lazy, however, is in the initial construction of the galaxies I'm trying to collide. I want to design a galaxy that will at least sort of hold together by its own gravity until it smash it into another one.   How might I go about selecting the orbital velocities for each of the bodies composing the galaxy? I use both GNOME and KDE SC. In GNOME, I use Docky but I do not use it with KDE. So, I would like Docky to start up only when I login into GNOME not KDE. In KDE, there is an option to make a program autostart only in KDE. But I cannot find any such option in GNOME.    How can I do this?    Thanks in advance. Solving 2-degree equations in 3 variables. We are given 3 equations: $x^2+\sqrt3 xy + y^2 = 25$ $y^2 + z^2 = 9$ $x^2 +xz+ z^2 = 16$. $x,y,z$ are positive real numbers. Then we have to find value of $xy + 2yz + \sqrt3 xz$. Find the equation of the plane passing through a point and a vector orthogonal I have come across this question that I need a tip for.     Find the equation (general form) of the plane passing through the point $P(3,1,6)$ that is orthogonal to the vector $v=(1,7,-2)$.   I would be able to do this if it said "parallel to the vector"  I would set the equation up as $(x,y,x) = (3,1,6) + t(1,7,-2)$ and go from there.  I don't get where I can get an orthogonal vector. Normally when I am finding an orthogonal vector I have two other vectors and do the cross product to find it.  I am thinking somehow I have to get three points on the plane, but I'm not sure how to go about doing that.  Any pointers?  thanks in advance. Is there any subtle difference between:   We need to carry in some stuff so open the door and leave it open. We need to carry in some stuff so open the door and leave it opened.   I mean "leave it like that (in that state)". Can I perform a DNS lookup (hostname to IP address) using client-side Javascript? Shine a light into a superconductor A type-I superconductor can expel almost all magnetic flux (below some critical value $H_c$) from its interior when superconducting. Light as we know is an electromagnetic wave. So what would happen if we shine a light deep into a type-I superconductor? Suppose the magnetic field of the light is significantly lower than $H_c$.  And what about type-II superconductors? Exponential of the differential operator I am not sure whether this question is even well-posed. But today I learnt that $e^Df(x) = f(x+1)$ where $D$ is differential operator and  $$e^D \triangleq \sum_{i=0}^{\infty} \frac{D^i}{i!}.$$  (ref. )  So I was curious as to whether the differential equation  $$\frac{df(t)}{dt} = e^Df(t) = f(t+1)$$  has any solutions apart from $f = 0$? Summation of natural number set with power of $m$ Who knows about the summation of this series: $$\sum\limits_{i=1}^{n}i^m $$  where $m$ is constant and $m\in \mathbb{N}$?  thanks string str1 = "12345ABC...\\...ABC100000";   // Hypothetically huge string of 100000 + Unicode Chars  str1 = str1.Replace("1", string.Empty);  str1 = str1.Replace("22", string.Empty);  str1 = str1.Replace("656", string.Empty);  str1 = str1.Replace("77ABC", string.Empty);   // ...  this replace anti-pattern might happen with upto 50 consecutive lines of code.   str1 = str1.Replace("ABCDEFGHIJD", string.Empty);   I have inherited some code that does the same as the snippet above. It takes a huge string and replaces (removes) constant smaller strings from the large string.  I believe this is a very memory intensive process given that new large immutable strings are being allocated in memory for each replace, awaiting death via the GC.  1. What is the fastest way of replacing these values, ignoring memory concerns?  2. What is the most memory efficient way of achieving the same result?  I am hoping that these are the same answer!  Practical solutions that fit somewhere in between these goals are also appreciated.  Assumptions:    All replacements are constant and known in advance Underlying characters do contain some unicode [non-ascii] chars prevent "action" if top of page I have a manual list of stuff that are sometimes separated by an hrule(or my own custom ruler) for visual purposes.  Sometimes the hrule ends at the top or bottom of a page which makes it useless.  Is there a way to prevent it from being added if it is at the top or bottom of a page?    MWE of problem:  \documentclass{book} \usepackage{tikz} \begin{document} \newcommand\rulesep{%   \par % make sure we end a paragraph   \vskip5pt % space above the rule   \leaders\vrule width \textwidth\vskip0.4pt % rule thickness is 0.4pt   \nointerlineskip % disable interline glue here   \vskip5pt % space below the rule } \def\dotikzcircle#1{\begin{tikzpicture}\draw(0,0)circle(#1);\end{tikzpicture}} \rulesep \noindent This is a test\noindent \rulesep \noindent End of test \rulesep \dotikzcircle3 \rulesep \begin{center}\dotikzcircle3\end{center} \rulesep \begin{center}\dotikzcircle3\end{center} \rulesep \dotikzcircle1 \rulesep \dotikzcircle2 \rulesep \dotikzcircle3 \rulesep \dotikzcircle4 \rulesep \dotikzcircle5 \rulesep  \end{document}