What is the way to obtain a thread safe counter in C# with best possible performance? This is as simple as it gets: public static long GetNextValue() { long result; lock (LOCK) { result = COUNTER++; } return result; } But are there faster alternatives? 5 Answers 5
Other than doing list comprehensions of reversed list comprehension, is there a pythonic way to sort Counter by value? If so, it is faster than this: >>> from collections import Counter >>> x = Counter({‘a’:5, ‘b’:3, ‘c’:7}) >>> sorted(x) [‘a’, ‘b’, ‘c’] >>> sorted(x.items()) [(‘a’, 5), (‘b’, 3), (‘c’, 7)] >>> [(l,k) for k,l in … Read more
I need to find the frequency of elements in an unordered list a = [1,1,1,1,2,2,2,2,3,3,4,5,5] output-> b = [4,4,2,1,2] Also I want to remove the duplicates from a a = [1,2,3,4,5] 34 Answers 34 In Python 2.7 (or newer), you can use collections.Counter: import collections a = [1,1,1,1,2,2,2,2,3,3,4,5,5] counter=collections.Counter(a) print(counter) # Counter({1: 4, 2: 4, … Read more
Caution: question still applies to for…of loops.> Don’t use for…in to iterate over an Array, use it to iterate over the properties of an object. That said, this I understand that the basic for…in syntax in JavaScript looks like this: for (var obj in myArray) { // … } But how do I get the … Read more
Timer is used to schedule tasks.. So where do you write those tasks?? Well you have to write those tasks in a TimerTask class… Confused ? Let me break it down, Timer timer = new Timer(); Now you have created a object of Timer class .. Now you have to do some task right? So to do that create … Read more
