nested-loops

Does every recursive function have an equivalent for loop? (Both achieve the same result). I have this recursive function: private static boolean recur(String word, int length) { if(length == 1 || length == 2) return false; if(length == 0) return true; if(words[length].contains(word.substring(0, length))) return recur(word.substring(length), word.length() - length); return recur(word, length-1); } Given that words is a Set[], and where words[i] = a set with words of length i. What am trying to do is: initiate the recursion with a word (say, "stackoverflow", no spaces), I am trying to find if

Is there a way to create for-loops of a form for(int i = 0; i < 9; ++i) { for(int j = 0; j < 9; ++i) { //... for(int k = 0; k < 9; ++k) { //N-th loop without knowing N at the compile time. Ideally I'm trying to figure out a way to loop through separate elements of a vector of digits to create each possible number if a certain amount of digits is replaced with different digits. You may use recursion instead with a base condition - void doRecursion(int baseCondition){ if(baseCondition==0) return; //place your code here doRecursion(baseCondition-1); } Now you don't need to provide the

I just found out about using label s in JavaScript, such as: for (var i in team) { if(i === "something") { break doThis: //Goto the label } else { doThat(); } } doThis: //Label doIt(); I've not heard about this until now and I can't find much information online about it and I'm beginning to think there is a reason for that. It seems to me like this is similar to a GOTO statement in other languages and would be considered bad practice. Would I be right in assuming this? Those are loop breaker identifiers. They are useful if you have nested loops (loops inside loops) and using these identifiers,

This problem has been getting at me for a while now. Is there an easier way to write nested for loops in python? For example if my code went something like this: for y in range(3): for x in range(3): do_something() for y1 in range(3): for x1 in range(3): do_something_else() would there be an easier way to do this? I know that this code works but when you indent instead of using 2 spaces, like me, it can get to be a problem. Oh in the example there were only 4 nested for loops to make things easier. If you're frequently iterating over a Cartesian product like in your example, you might want to

My question is about performance in my NodeJS app... If my program run 12 iteration of 1.250.000 each = 15.000.000 iterations all together - it takes dedicated servers at Amazon the following time to process: r3.large: 2 vCPU, 6.5 ECU, 15 GB memory --> 123 minutes 4.8xlarge: 36 vCPU, 132 ECU, 60 GB memory --> 102 minutes I have some code similair to the code below... start(); start(){ for(var i=0; i<12; i++){ function2(); // Iterates over a collection - which contains data split up in intervals - by date intervals. This function is actually also recursive - due to the fact - that is run