Arrays.asList(A) returns a List<int[]>. This is because it expects an array of objects, not primitive types. Your options include: use Integer[] instead of int[] inline the array, and let autoboxing take care of it; Arrays.asList(3,8,2,5,1,4,7,9) will work fine use Guava’s Ints.asList(int…) method to view the primitive array as a List<Integer>. (Disclosure: I contribute to Guava.) … Read more
Clean method to check for vowels: public static boolean isVowel(char c) { return “AEIOUaeiou”.indexOf(c) != -1; }
At least three ways: A regular expression: var result = /[^/]*$/.exec(“foo/bar/test.html”)[0]; …which says “grab the series of characters not containing a slash” ([^/]*) at the end of the string ($). Then it grabs the matched characters from the returned match object by indexing into it ([0]); in a match object, the first entry is the … Read more
Array.indexOf() will only work on objects if the supplied object is exactly the same object you put in. An exact copy is insufficient, it has to be the exact same object, i.e. there must be some object in the array such that: arr[i] === obj You need to show how you retrieved the object.
string s = “hello”; char c = s[1]; // now c == ‘e’ See also Substring, to return more than one character.
Maybe you would like to use higher-order functions such as “map”. Assuming you want search by ‘field’ attribute: var elementPos = array.map(function(x) {return x.id; }).indexOf(idYourAreLookingFor); var objectFound = array[elementPos];
You cannot use indexOf to do complicated arrays (unless you serialize it making everything each coordinate into strings), you will need to use a for loop (or while) to search for that coordinate in that array assuming you know the format of the array (in this case it is 2d). var arr = [[2,3],[5,8],[1,1],[0,9],[5,7]]; var … Read more
The error message is misleading. What you actually need is to provide the compiler a way to compare two Meme instances and decide upon which criteria those instances are equal. Let’s say you want two instances having the same name property to be treated as equal. We make the struct conform to Equatable and we … Read more
string[] myarr = new string[] {“s”, “f”, “s”}; int[] v = myarr.Select((b,i) => b == “s” ? i : -1).Where(i => i != -1).ToArray(); This will return 0, 2 If the value does not exist in the array then it will return a int[0]. make an extension method of it public static class EM { … Read more
Not sure what would perform faster but this would be more reliable when it comes to extension like .jpeg or .html x.replace(/\.[^/.]+$/, “”)