sorted() returns a new sorted list, leaving the original list unaffected. list.sort() sorts the list in-place, mutating the list indices, and returns None (like all in-place operations). sorted() works on any iterable, not just lists. Strings, tuples, dictionaries (you’ll get the keys), generators, etc., returning a list containing all elements, sorted. Use list.sort() when you … Read more
Yes, you should iterate over 2D boolean array in order to deep copy it. Also look at java.util.Arrays#copyOf methods if you are on Java 6. I would suggest the next code for Java 6: public static boolean[][] deepCopy(boolean[][] original) { if (original == null) { return null; } final boolean[][] result = new boolean[original.length][]; for … Read more
There are at least 6 (!) ways to clone an array: loop slice Array.from() concat spread operator (FASTEST) map A.map(function(e){return e;}); There has been a huuuge BENCHMARKS thread, providing following information: for blink browsers slice() is the fastest method, concat() is a bit slower, and while loop is 2.4x slower. for other browsers while loop … Read more
E0_copy is not a deep copy. You don’t make a deep copy using list(). (Both list(…) and testList[:] are shallow copies.) You use copy.deepcopy(…) for deep copying a list. deepcopy(x, memo=None, _nil=[]) Deep copy operation on arbitrary Python objects. See the following snippet – >>> a = [[1, 2, 3], [4, 5, 6]] >>> b … Read more
I would avoid the use of a mega api like apache commons. This is a simplistic operation and its built into the JDK in the new NIO package. It was kind of already linked to in a previous answer, but the key method in the NIO api are the new functions “transferTo” and “transferFrom”. http://java.sun.com/javase/6/docs/api/java/nio/channels/FileChannel.html#transferTo(long,%20long,%20java.nio.channels.WritableByteChannel) … Read more
You can try using System.arraycopy() int[] src = new int[]{1,2,3,4,5}; int[] dest = new int[5]; System.arraycopy( src, 0, dest, 0, src.length ); But, probably better to use clone() in most cases: int[] src = … int[] dest = src.clone();
If anyone else is having the same problem, this is how I did it private void copyAssets() { AssetManager assetManager = getAssets(); String[] files = null; try { files = assetManager.list(“”); } catch (IOException e) { Log.e(“tag”, “Failed to get asset file list.”, e); } if (files != null) for (String filename : files) { … Read more
It is clear that you have some misconceptions of what the statement var tempMyObj = myObj; does. In JavaScript objects are passed and assigned by reference (more accurately the value of a reference), so tempMyObj and myObj are both references to the same object. Here is a simplified illustration that may help you visualize what … Read more
Yes, it’s subassignment in R using <- (or = or ->) that makes a copy of the whole object. You can trace that using tracemem(DT) and .Internal(inspect(DT)), as below. The data.table features := and set() assign by reference to whatever object they are passed. So if that object was previously copied (by a subassigning <- … Read more
Normal assignment operations will simply point the new variable towards the existing object. The docs explain the difference between shallow and deep copies: The difference between shallow and deep copying is only relevant for compound objects (objects that contain other objects, like lists or class instances): A shallow copy constructs a new compound object and … Read more