If I have a for loop which is nested within another, how can I efficiently come out of both loops (inner and outer) in the quickest possible way? I don’t want to have to use a boolean and then have to say go to another method, but rather just to execute the first line of … Read more
In my application i am using AJAX call. I want to use break and continue in this jQuery loop. $(‘.submit’).filter(‘:checked’).each(function() { }); 4 Answers 4
I’d like to know the best way (more compact and “pythonic” way) to do a special treatment for the last element in a for loop. There is a piece of code that should be called only between elements, being suppressed in the last one. Here is how I currently do it: for i, data in … Read more
Take the following two lines of code: for (int i = 0; i < some_vector.size(); i++) { //do stuff } And this: for (some_iterator = some_vector.begin(); some_iterator != some_vector.end(); some_iterator++) { //do stuff } I’m told that the second way is preferred. Why exactly is this? 27 Answers 27
How to get the index in a for each loop? I want to print numbers for every second iteration For example for (value in collection) { if (iteration_no % 2) { //do something } } In java, we have the traditional for loop for (int i = 0; i < collection.length; i++) How to get … Read more
I have a list consisting of like 20000 lists. I use each list’s 3rd element as a flag. I want to do some operations on this list as long as at least one element’s flag is 0, it’s like: my_list = [[“a”, “b”, 0], [“c”, “d”, 0], [“e”, “f”, 0], …..] In the beginning, all … Read more
How would I do a for loop on every character in string in C++? 10 Answers 10
This question already has answers here: What is the most “pythonic” way to iterate over a list in chunks? (38 answers) Closed 2 years ago. I want to loop through a Python list and process 2 list items at a time. Something like this in another language: for(int i = 0; i < list.length(); i+=2) … Read more
I’ve heard this quite a few times. Are JavaScript loops really faster when counting backward? If so, why? I’ve seen a few test suite examples showing that reversed loops are quicker, but I can’t find any explanation as to why! I’m assuming it’s because the loop no longer has to evaluate a property each time … Read more
Is it possible to declare two variables of different types in the initialization body of a for loop in C++? For example: for(int i=0,j=0 … defines two integers. Can I define an int and a char in the initialization body? How would this be done? 8 Answers 8
