The issue here is that the compiler interprets the statement test(_b); not as code that creates a temporary object of type test passing in parameter _b, but as a variable declaration for a variable named _b of type test, using the default constructor. Consequently, what looks like a piece of code that creates a temporary … Read more
You invoke test(45). This tests whether 45 > 9, which is true, so it invokes test(35) (45 – 10), without returning its result. The same thing happens with test(25) and test(15), until finally test(5) is invoked. This prints ‘real value 5’, and then returns 5. But returning a result from a function always returns it … Read more
You can break it down into two statements and use the magic of captured variables to achieve the recursion effect: myDelegate build = null; build = delegate(Object bj) { var letters= string.Empty; if (someCondition) return build(some_obj); else string.Empty; };
The problem here is that BankAccount, BuckysButtons, multiview, rotator and segmentedControls are all git submodules, which act like independent repositories in many ways. If what you want to do is to run git add -A . in each submodule, you could do: git submodule foreach –recursive git add -A . And then you could create … Read more
Iteration is more performant than recursion, right? Not necessarily. This conception comes from many C-like languages, where calling a function, recursive or not, had a large overhead and created a new stackframe for every call. For many languages this is not the case, and recursion is equally or more performant than an iterative version. These … Read more
You could use functools.reduce: import functools def rsetattr(obj, attr, val): pre, _, post = attr.rpartition(‘.’) return setattr(rgetattr(obj, pre) if pre else obj, post, val) # using wonder’s beautiful simplification: https://stackoverflow.com/questions/31174295/getattr-and-setattr-on-nested-objects/31174427?noredirect=1#comment86638618_31174427 def rgetattr(obj, attr, *args): def _getattr(obj, attr): return getattr(obj, attr, *args) return functools.reduce(_getattr, [obj] + attr.split(‘.’)) rgetattr and rsetattr are drop-in replacements for getattr and … Read more
An example in JavaScript Here’s an example using JavaScript. Currently, most browsers do not support tail call optimisation and therefore the following snippet will fail const repeat = n => f => x => n === 0 ? x : repeat (n – 1) (f) (f(x)) console.log(repeat(1e3) (x => x + 1) (0)) // 1000 … Read more
Python don’t have a great support for recursion because of it’s lack of TRE (Tail Recursion Elimination). This means that each call to your recursive function will create a function call stack and because there is a limit of stack depth (by default is 1000) that you can check out by sys.getrecursionlimit (of course you … Read more
Ok, I found some free time finally. Here we go: class TreeNode { public string Value { get; set;} public List<TreeNode> Nodes { get; set;} public TreeNode() { Nodes = new List<TreeNode>(); } } Action<TreeNode> traverse = null; traverse = (n) => { Console.WriteLine(n.Value); n.Nodes.ForEach(traverse);}; var root = new TreeNode { Value = “Root” }; … Read more
You can use Directory.GetFiles to replace your method. Directory.GetFiles(dirPath, “*”, SearchOption.AllDirectories)