In terms of performance in Python, is a list-comprehension, or functions like map(), filter() and reduce() faster than a for loop? Why, technically, they run in a C speed, while the for loop runs in the python virtual machine speed?. Suppose that in a game that I’m developing I need to draw complex and huge … Read more
Is there a token in java that skips the rest of the for loop? Something like VB’s Continue in java. 6 Answers 6
How can I loop through a List and grab each item? I want the output to look like this: Console.WriteLine(“amount is {0}, and type is {1}”, myMoney.amount, myMoney.type); Here is my code: static void Main(string[] args) { List<Money> myMoney = new List<Money> { new Money{amount = 10, type = “US”}, new Money{amount = 20, type … Read more
As described here TypeScript introduces a foreach loop: var someArray = [9, 2, 5]; for (var item of someArray) { console.log(item); // 9,2,5 } But isn’t there any index/key? I would expect something like: for (var item, key of someArray) { … } 5 Answers 5
Is it possible to do following without the i? for i in range(some_number): # do something If you just want to do something N amount of times and don’t need the iterator. 15 Answers 15
Does the “for…in” loop in Javascript loop through the hashtables/elements in the order they are declared? Is there a browser which doesn’t do it in order? The object I wish to use will be declared once and will never be modified. Suppose I have: var myObject = { A: “Hello”, B: “World” }; And I … Read more
This question already has answers here: Difference between pre-increment and post-increment in a loop? (23 answers) Closed 7 years ago. The following for loops produce identical results even though one uses post increment and the other pre-increment. Here is the code: for(i=0; i<5; i++) { printf(“%d”, i); } for(i=0; i<5; ++i) { printf(“%d”, i); } … 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
If I have the following array of objects: [ { id: 1, username: ‘fred’ }, { id: 2, username: ‘bill’ }, { id: 2, username: ‘ted’ } ] Is there a way to loop through the array to check whether a particular username value already exists and if it does do nothing, but if it … Read more
I am new to the C++ language. I have been starting to use vectors, and have noticed that in all of the code I see to iterate though a vector via indices, the first parameter of the for loop is always something based on the vector. In Java I might do something like this with … Read more
