I’m looking for a one line solution that would help me do the following. Suppose I have array = np.array([10, 20, 30, 40, 50]) I’d like to rearrange it based upon an input ordering. If there were a numpy function called arrange, it would do the following: newarray = np.arrange(array, [1, 0, 3, 4, 2]) … Read more
I need to search a pattern in a directory and save the names of the files which contain it in an array. Searching for pattern: grep -HR “pattern” . | cut -d: -f1 This prints me all filenames that contain “pattern”. If I try: targets=$(grep -HR “pattern” . | cut -d: -f1) length=${#targets[@]} for ((i … Read more
I am writing an Array-derived class in JavaScript and need to know which functions to overload so that I can be aware of changes made to the array. I know Array.push() and Array.splice() are mutating. Is there a definitive list of any others? Answer You can find the list on MDN as Mutator methods (along … Read more
I am trying to create an array of strings in C using malloc. The number of strings that the array will hold can change at run time, but the length of the strings will always be consistent. I’ve attempted this (see below), but am having trouble, any tips in the right direction will be much … Read more
Given an array of objects : people = [ {id: “1”, name: “abc”, gender: “m”, age:”15″ }, {id: “2”, name: “a”, gender: “m”, age:”25″ }, {id: “3”, name: “efg”, gender: “f”, age:”5″ }, {id: “4”, name: “hjk”, gender: “m”, age:”35″ }, {id: “5”, name: “ikly”, gender: “m”, age:”41″ }, {id: “6”, name: “ert”, gender: “f”, … Read more
In my angular2 app i want to create a map which takes a number as key and returns an array of objects. I am currently implementing in following way but no luck. How should i implement it or should i use some other data structure for this purpose? I want to use map because maybe … Read more
What is the C++ way of checking if an element is contained in an array/list, similar to what the in operator does in Python? if x in arr: print “found” else print “not found” How does the time complexity of the C++ equivalent compare to Python’s in operator? Answer The time complexity of Python’s in … Read more
For the purpose of this question lets say we need to append() 1000 objects to the body element. You could go about it like this: for(x = 0; x < 1000; x++) { var element = $(‘<div>’+x+'</div>’); $(‘body’).append(element); } This works, however it seems inefficient to me as AFAIK this will cause 1000 document reflows. … Read more
E.g. why does val list:List[Any] = List[Int](1,2,3) work, but val arr:Array[Any] = Array[Int](1,2,3) fails (because arrays are invariant). What is the desired effect behind this design decision? Answer Because it would break type-safety otherwise. If not, you would be able to do something like this: val arr:Array[Int] = Array[Int](1,2,3) val arr2:Array[Any] = arr arr2(0) = … Read more
This question already has answers here: What’s the simplest way to print a Java array? (34 answers) Closed 6 years ago. Is there any function in java like toString() to print a String array? This is a silly question but I want to know if there is any other way than writing a for loop. … Read more
