Ian Mercer posted a similar solution as this on Phil Haack’s blog: foreach (var item in Model.Select((value, i) => new { i, value })) { var value = item.value; var index = item.i; } This gets you the item (item.value) and its index (item.i) by using this overload of LINQ’s Select: the second parameter of … Read more
for (Iterator<String> i = someIterable.iterator(); i.hasNext();) { String item = i.next(); System.out.println(item); } Note that if you need to use i.remove(); in your loop, or access the actual iterator in some way, you cannot use the for ( : ) idiom, since the actual iterator is merely inferred. As was noted by Denis Bueno, this … Read more
The compiler declares the variable in a way that makes it highly prone to an error that is often difficult to find and debug, while producing no perceivable benefits. Your criticism is entirely justified. I discuss this problem in detail here: Closing over the loop variable considered harmful Is there something you can do with … Read more
There’s no built-in ability to break in forEach. To interrupt execution you would have to throw an exception of some sort. eg. var BreakException = {}; try { [1, 2, 3].forEach(function(el) { console.log(el); if (el === 2) throw BreakException; }); } catch (e) { if (e !== BreakException) throw e; } JavaScript exceptions aren’t terribly … Read more
foreach supports iteration over three different kinds of values: Arrays Normal objects Traversable objects In the following, I will try to explain precisely how iteration works in different cases. By far the simplest case is Traversable objects, as for these foreach is essentially only syntax sugar for code along these lines: foreach ($it as $k … Read more