Getting number of elements in an iterator in Python
Is there an efficient way to know how many elements are in an iterator in Python, in general, without iterating through each and counting? 19 Answers 19
iterator
What is the reason behind cbegin/cend?
I wonder why cbegin and cend were introduced in C++11? What are cases when calling these methods makes a difference from const overloads of begin and end? 7 Answers 7
Why are Standard iterator ranges [begin, end) instead of [begin, end]?
Why does the Standard define end() as one past the end, instead of at the actual end? 7 Answers 7
Why use non-member begin and end functions in C++11?
Every standard container has a begin and end method for returning iterators for that container. However, C++11 has apparently introduced free functions called std::begin and std::end which call the begin and end member functions. So, instead of writing auto i = v.begin(); auto e = v.end(); you’d write auto i = std::begin(v); auto e = … Read more
Iterating over Typescript Map
I’m trying to iterate over a typescript map but I keep getting errors and I could not find any solution yet for such a trivial problem. My code is: myMap : Map<string, boolean>; for(let key of myMap.keys()) { console.log(key); } And I get the Error: Type ‘IterableIteratorShim<[string, boolean]>’ is not an array type or a … Read more
C++ STL Vectors: Get iterator from index?
So, I wrote a bunch of code that accesses elements in an stl vector by index[], but now I need to copy just a chunk of the vector. It looks like vector.insert(pos, first, last) is the function I want… except I only have first and last as ints. Is there any nice way I can … Read more
What is the difference between iterator and iterable and how to use them?
I am new in Java and I’m really confused with iterator and iterable. Can anyone explain to me and give some examples? 14 Answers 14
Iterate through a C++ Vector using a ‘for’ loop
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
How to get a reversed list view on a list in Java?
I want to have a reversed list view on a list (in a similar way than List#sublist provides a sublist view on a list). Is there some function which provides this functionality? I don’t want to make any sort of copy of the list nor modify the list. It would be enough if I could … Read more
