Actually, the section from where you took that code offers an explanation as well: To move n discs from peg A to peg C: move n−1 discs from A to B. This leaves disc #n alone on peg A move disc #n from A to C move n−1 discs from B to C so they … Read more
I favor recursive solutions when: The implementation of the recursion is much simpler than the iterative solution, usually because it exploits a structural aspect of the problem in a way that the iterative approach cannot I can be reasonably assured that the depth of the recursion will not cause a stack overflow, assuming we’re talking … Read more
I think that this could help you. It is from an answer I found on a Google Group about recursive elements in a tree. The suggestion is from Brendan Owen: http://jsfiddle.net/brendanowen/uXbn6/8/ <script type=”text/ng-template” id=”field_renderer.html”> {{data.label}} <ul> <li ng-repeat=”field in data.fields” ng-include=”‘field_renderer.html'”></li> </ul> </script> <ul ng-controller=”NestedFormCtrl”> <li ng-repeat=”field in formData” ng-include=”‘field_renderer.html'”></li> </ul> The proposed solution is … Read more
You’re defining a function in terms of itself. In general, fibonnaci(n) = fibonnaci(n – 2) + fibonnaci(n – 1). We’re just representing this relationship in code. So, for fibonnaci(7) we can observe: fibonacci(7) is equal to fibonacci(6) + fibonacci(5) fibonacci(6) is equal to fibonacci(5) + fibonacci(4) fibonacci(5) is equal to fibonacci(4) + fibonacci(3) fibonacci(4) is … Read more
new-if is a function. When a function is called, what’s the first thing that Scheme does with the argument list? It evaluates all the arguments.
There are a few ways to do this. You can put closures into a struct and pass this struct to the closure. You can even define structs inline in a function: fn main() { struct Fact<‘s> { f: &’s dyn Fn(&Fact, u32) -> u32 } let fact = Fact { f: &|fact, x| if x … Read more
A real world example of recursion
To answer your specific question: No, from the standpoint of learning a language, recursion isn’t a feature. If your professor really docked you marks for using a “feature” he hadn’t taught yet, that was wrong. Reading between the lines, one possibility is that by using recursion, you avoided ever using a feature that was supposed … Read more
There are a number of good explanations of recursion in this thread, this answer is about why you shouldn’t use it in most languages.* In the majority of major imperative language implementations (i.e. every major implementation of C, C++, Basic, Python, Ruby,Java, and C#) iteration is vastly preferable to recursion. To see why, walk through … Read more
Increase the value of xdebug.max_nesting_level in your php.ini