(Note: this answer is based on a short blog post about einsum I wrote a while ago.) What does einsum do? Imagine that we have two multi-dimensional arrays, A and B. Now let’s suppose we want to… multiply A with B in a particular way to create new array of products; and then maybe sum … Read more
$myArray = []; Creates empty array. You can push values onto the array later, like so: $myArray[] = “tree”; $myArray[] = “house”; $myArray[] = “dog”; At this point, $myArray contains “tree”, “house” and “dog”. Each of the above commands appends to the array, preserving the items that were already there. Having come from other languages, … Read more
Use forEach its a built-in array function. Array.forEach(): yourArray.forEach(function (arrayItem) { var x = arrayItem.prop1 + 2; console.log(x); });
You can use slice() to make a copy then reverse() it var newarray = array.slice().reverse(); var array = [‘a’, ‘b’, ‘c’, ‘d’, ‘e’]; var newarray = array.slice().reverse(); console.log(‘a’, array); console.log(‘na’, newarray);
I know that this question has an accepted answer but I thought I’d chip in with an alternative which uses array.reduce, seeing that summing an array is the canonical example for reduce: $scope.sum = function(items, prop){ return items.reduce( function(a, b){ return a + b[prop]; }, 0); }; $scope.travelerTotal = $scope.sum($scope.traveler, ‘Amount’); Fiddle
Basic one dimensional arrays $array = array(3, 5, 2, 8); Applicable sort functions: sort rsort asort arsort natsort natcasesort ksort krsort The difference between those is merely whether key-value associations are kept (the “a” functions), whether it sorts low-to-high or reverse (“r“), whether it sorts values or keys (“k“) and how it compares values (“nat” … Read more
If you don’t want to change the strings, then you could simply do const char *a[2]; a[0] = “blah”; a[1] = “hmm”; When you do it like this you will allocate an array of two pointers to const char. These pointers will then be set to the addresses of the static strings “blah” and “hmm”. … Read more
Save yourself some pain… using System.Linq; int[] ints = new [] { 10, 20, 10, 34, 113 }; List<int> lst = ints.OfType<int>().ToList(); // this isn’t going to be fast. Can also just… List<int> lst = new List<int> { 10, 20, 10, 34, 113 }; or… List<int> lst = new List<int>(); lst.Add(10); lst.Add(20); lst.Add(10); lst.Add(34); lst.Add(113); … Read more
Try explode: $myString = “9,admin@example.com,8”; $myArray = explode(‘,’, $myString); print_r($myArray); Output : Array ( [0] => 9 [1] => admin@example.com [2] => 8 )
var result = string.Join(“,”, arr); This uses the following overload of string.Join: public static string Join<T>(string separator, IEnumerable<T> values);