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  • What are iterator, iterable, and iteration? - Stack Overflow
    So an iterable is an object that you can get an iterator from An iterator is an object with a next (Python 2) or __next__ (Python 3) method Whenever you use a for loop, or map, or a list comprehension, etc in Python, the next method is called automatically to get each item from the iterator, thus going through the process of iteration
  • python - How to build a basic iterator? - Stack Overflow
    Iterator objects in python conform to the iterator protocol, which basically means they provide two methods: __iter__() and __next__() The __iter__ returns the iterator object and is implicitly called at the start of loops The __next__() method returns the next value and is implicitly called at each loop increment This method raises a
  • Incrementing iterators: Is ++it more efficient than it++?
    The reason is that if the iterator class itself is at all complex, then because it++ has to return the value before it is incremented, the implementation will generally make a copy Vector iterators are probably "just pointers" (in optimised, non-debug builds), and both operator++s will be inlined Since the return value is unused the copy will
  • java - What is the difference between iterator and iterable and how to . . .
    And Iterable, Collection and List just declare abstract method 'iterator()' and ArrayList alone implements it I am going to show ArrayList source code with 'iterator()' method as follows for more detailed information 'iterator()' method returns an object of class 'Itr' which implements 'Iterator'
  • iterator - What does the yield keyword do in Python? - Stack Overflow
    See my references above, but in summary: an iterable has an __iter__ method returning an iterator An iterator additionally provides a __next__ method, which is implicitly called by for loops until it raises StopIteration, and once it does raise StopIteration, it will continue to do so It then uses a generator expression to describe what a
  • c++ - Iterator Loop vs index loop - Stack Overflow
    The special thing about iterators is that they provide the glue between algorithms and containers For generic code, the recommendation would be to use a combination of STL algorithms (e g find, sort, remove, copy) etc that carries out the computation that you have in mind on your data structure (vector, list, map etc ), and to supply that algorithm with iterators into your container
  • How to navigate through a vector using iterators? (C++)
    The advantage of using iterator is that you can apply the same pattern with other containers: sum = 0; for (Iter it = lst begin(); it!=lst end(); ++it) { sum += *it; } For this reason, it is really easy to create template code that will work the same regardless of the container type





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