Iteration is a general term for taking each item of something, one after another. Any time you use a loop, explicit or implicit, to go over a group of items, that is iteration. In Python, iterable and iterator have specific meanings. An iterable is an object that has an __iter__ method which returns an iterator, … Read more
Iterator.remove() is safe, you can use it like this: List<String> list = new ArrayList<>(); // This is a clever way to create the iterator and call iterator.hasNext() like // you would do in a while-loop. It would be the same as doing: // Iterator<String> iterator = list.iterator(); // while (iterator.hasNext()) { for (Iterator<String> iterator = … Read more
You can use a list comprehension to create a new list containing only the elements you don’t want to remove: somelist = [x for x in somelist if not determine(x)] Or, by assigning to the slice somelist[:], you can mutate the existing list to contain only the items you want: somelist[:] = [x for x … Read more
The reason is that one construct: var a = []; // Create a new empty array. a[5] = 5; // Perfectly legal JavaScript that resizes the array. for (var i = 0; i < a.length; i++) { // Iterate over numeric indexes from 0 to 5, as everyone expects. console.log(a[i]); } /* Will display: undefined … 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
If you’re only interested in the keys, you can iterate through the keySet() of the map: Map<String, Object> map = …; for (String key : map.keySet()) { // … } If you only need the values, use values(): for (Object value : map.values()) { // … } Finally, if you want both the key and … Read more
How do I efficiently iterate over each entry in a Java Map?
For-each over an array in JavaScript
Please look at the formatting tips, it will help you display your code as you wish. that said, I think this is what you want. The following code will iterate through each character in your list string. If it finds a match, it will print success list = “9876554321” for char in list: if char … Read more
That is not an error: If you stringify an Array containing two objects, that is the supposed output.