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What is the purpose of using an iterator in this function's return value?


What is the purpose of using an iterator in this function's return value?

By : Eric Broneer
Date : November 21 2020, 03:00 PM
seems to work fine
what is the reasoning behind comparing it with the set's end iterator?
code :
return find(c_rejectAddresses.begin(), c_rejectAddresses.end(), _addressToCheck) != NULL;


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PHP - (Large website) Multi-purpose functions or single-purpose functions?

PHP - (Large website) Multi-purpose functions or single-purpose functions?


By : atif.satti
Date : March 29 2020, 07:55 AM
I wish this help you Function names should reflect what they do. If a function is named ShowContact, it should show a contact. It shouldn't delete/update a contact any more than it should brew a cup of coffee.
trait with functions that return an iterator

trait with functions that return an iterator


By : user3920314
Date : March 29 2020, 07:55 AM
I hope this helps . Rust's libstd has one implementation of this, the trait IntoIterator.
code :
/// Conversion into an `Iterator`
pub trait IntoIterator {
    /// The type of the elements being iterated
    type Item;

    /// A container for iterating over elements of type `Item`
    type IntoIter: Iterator<Item=Self::Item>;

    /// Consumes `Self` and returns an iterator over it
    fn into_iter(self) -> Self::IntoIter;
}
impl<'a, K, V, S> IntoIterator for &'a HashMap<K, V, S>
    where K: Eq + Hash, S: HashState
{
    type Item = (&'a K, &'a V);
    type IntoIter = Iter<'a, K, V>;

    fn into_iter(self) -> Iter<'a, K, V> {
        self.iter()
    }
}

impl<K, V, S> IntoIterator for HashMap<K, V, S>
    where K: Eq + Hash, S: HashState
{
    type Item = (K, V);
    type IntoIter = IntoIter<K, V>;

    /// Creates a consuming iterator, that is, one that moves each key-value
    /// pair out of the map in arbitrary order. The map cannot be used after
    /// calling this.
    fn into_iter(self) -> IntoIter<K, V> {
        /* ... */
    }
}
Iterator-reducer pattern for functions that may or may not return a value

Iterator-reducer pattern for functions that may or may not return a value


By : Marcelo Evander
Date : March 29 2020, 07:55 AM
help you fix your problem I think you can just make a VoidReducer class, but instead of return reducer.value; you would need return reducer.getvalue();. Then you simply make void VoidReducer::getvalue(){}.
I haven't tested this but the idea should work. You are allowed to return f(); if both f and the current function have return type void.
code :
template <class Functor, class Reducer, class Elem>
void Combine(Functor functor, Reducer & reducer, Elem elem, std::true_type)
{
  functor(elem);
}

template <class Functor, class Reducer, class Elem>
void Combine(Functor functor, Reducer & reducer, Elem elem, std::false_type)
{
    reducer(functor(elem));
}

template <class Functor, class Reducer, class Elem>
void Combine(Functor functor, Reducer & reducer, Elem elem)
{
    Combine(functor, reducer, elem, std::is_same<decltype(functor(elem)), void>());
}
Why map and filter functions return iterator in python3?

Why map and filter functions return iterator in python3?


By : Arkadiusz Cywiński
Date : March 29 2020, 07:55 AM
wish helps you The reason map and filter operations return a (lazy) iterable is that sometimes there is no need for the list to be allocated. Generating a list requires calculating all results, as well as allocating memory which may be useless.
code :
sum(map(math.pow, range(10), repeat(2)))
any(map(math.sqrt, range(99999999999999999999)))
def is_odd(n):
    return n % 2

first_odd = next(filter(is_odd, range(10)))
Iterator of if-functions return errors

Iterator of if-functions return errors


By : Aravind C V
Date : March 29 2020, 07:55 AM
I hope this helps you . You have a syntax error. Pythons for loops are defined as for x in y:. You forgot about the :. The colons are also needed after ifs or elifs or elses
Also, you don't have to convert a range() into a list. range() in Python3 returns a generator, which you can safely iterate on (in Python2 you would have to use xrange).
code :
ConvertString = input("Enter a string: ")
StringList = list(ConvertString)
print (StringList)
for x in StringList:
  if x == "a":
    print("Letter found: a")
  elif x == "b":
    print("Letter found: b")
  elif x == "c":
    print("Letter found: c")
  elif x == "d":
    print("Letter found: d")
  elif x == "e":
    print("Letter found: e")
  elif x == "f":
    print("Letter found: f")
ConvertString = input("Enter a string: ")
StringList = list(ConvertString)
print (StringList)
for x in StringList:
  print(f"Letter found: {x}")
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