There are at least two reasons why this is disallowed: You would need to have two concurrent mutable references to map — one held by the iterator used in the for loop and one in the variable map to call map.remove. You have references to the key and the value within the map when trying … Read more
You can use linear indexing to access each element. for idx = 1:numel(array) element = array(idx) …. end This is useful if you don’t need to know what i,j,k, you are at. However, if you don’t need to know what index you are at, you are probably better off using arrayfun()
You can use zip(), which creates a sequence of pairs from the two given sequences: let strArr1 = [“Some1”, “Some2”] let strArr2 = [“Somethingelse1”, “Somethingelse2”] for (e1, e2) in zip(strArr1, strArr2) { print(“\(e1) – \(e2)”) } The sequence enumerates only the “common elements” of the given sequences/arrays. If they have different length then the additional … Read more
A generator function would be neat: def batch_gen(data, batch_size): for i in range(0, len(data), batch_size): yield data[i:i+batch_size] Example use: a = “abcdef” for i in batch_gen(a, 2): print i prints: ab cd ef
The mock_open() object does indeed not implement iteration. If you are not using the file object as a context manager, you could use: m = unittest.mock.MagicMock(name=”open”, spec=open) m.return_value = iter(self.TEST_TEXT) with unittest.mock.patch(‘builtins.open’, m): Now open() returns an iterator, something that can be directly iterated over just like a file object can be, and it’ll also … Read more
def pairs(lst): i = iter(lst) first = prev = item = i.next() for item in i: yield prev, item prev = item yield item, first Works on any non-empty sequence, no indexing required.
Here’s a way to do it by making use of the way adding one day causes the date to roll over to the next month if necessary, and without messing around with milliseconds. Daylight savings aren’t an issue either. var now = new Date(); var daysOfYear = []; for (var d = new Date(2012, 0, … Read more
Because Array.ToString() does not return the contents of the array, it returns the type name, and Console.WriteLine implicitly calls ToString() on each object you send it as a parameter. This has no regard to the fact that the array is part of a multi-dimensional array, it is simply the way the CLR developers chose to … Read more
Guava (formerly Google Collections) has Iterators.concat.
Dart iterables now have a reduce function (https://code.google.com/p/dart/issues/detail?id=1649), so you can do a sum pithily without defining your own fold function: var sum = [1, 2, 3].reduce((a, b) => a + b);