Iterators - language feature

Example from Java, Pizza, Oracle Java, Deesel:

Iterator iter = list.iterator();
//Iterator<MyType> iter = list.iterator();    in J2SE 5.0
while (iter.hasNext()) {
    System.out.print(iter.next());
    if (iter.hasNext())
        System.out.print(", ");
}

Example from Python, Cython:

https://www.w3schools.com/python/python_iterators.asp

Example from C++, Real-Time Concurrent C:

std::vector<int> items;
items.push_back(5);  // Append integer value '5' to vector 'items'.
items.push_back(2);  // Append integer value '2' to vector 'items'.
items.push_back(9);  // Append integer value '9' to vector 'items'.

for (auto it = items.begin(); it != items.end(); ++it) {  // Iterate through 'items'.
  std::cout << *it;  // And print value of 'items' for current index.
}

Example from Ruby:

(0...42).each do |n|
  puts n
end

Example from MATLAB:

% Define an array of integers
myArray = [1,3,5,7,11,13];

for n = myArray
   % ... do something with n
   disp(n)  % Echo integer to Command Window
end

Example from Rust:

for n in 0..42 {
  println!("{}", n);
}

Example from Speedie:

|| items = [5,6,7,8]
for i in items
 printline i

Languages with Iterators include Java, Python, C++, Ruby, MATLAB, Rust, Cython, Speedie, Pizza, Oracle Java, Deesel, Real-Time Concurrent C

Languages without Iterators include progsbase

This question asks: Does this language have iterators?

Read more about Iterators on the web: 1.

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