window.location is an accessor property, and getting its value gives you an object, not a string, and so it doesn’t have an indexOf function. (It’s perfectly understandable that people sometimes think it’s a string, since when you set its value, the accessor property’s setter accepts a string; that is, window.location = “some url”; actually works. … Read more
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
Use overloaded version of indexOf(), which takes the starting index (fromIndex) as 2nd parameter: str.indexOf(“is”, str.indexOf(“is”) + 1);
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.
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
Clean method to check for vowels: public static boolean isVowel(char c) { return “AEIOUaeiou”.indexOf(c) != -1; }
I don’t think you need to be too fancy about it. The following should work fine: static <T> List<Integer> indexOfAll(T obj, List<T> list) { final List<Integer> indexList = new ArrayList<>(); for (int i = 0; i < list.size(); i++) { if (obj.equals(list.get(i))) { indexList.add(i); } } return indexList; }
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
There is a second variant of the indexOf method, which takes a start-index as a parameter. i = str.indexOf(‘x’); while(i >= 0) { System.out.println(i); i = str.indexOf(‘x’, i+1); }