java.lang.Object has no a methods declared (2), while the anonymous class returned by the class instance creation expression new Object() { public void a() {} } does (1). Use Java 10’s local variable type inference (var) to make the second option as valid as the first one. var object = new Object() { public void … Read more
Instead of calling clone on the array itself, you can call it on each of the array’s elements using map: b = a.map(&:clone) This works in the example stated in the question, because you get a new instance for each element in the array.
This function removes duplicate values from an array by returning a new one. function removeDuplicatesBy(keyFn, array) { var mySet = new Set(); return array.filter(function(x) { var key = keyFn(x), isNew = !mySet.has(key); if (isNew) mySet.add(key); return isNew; }); } var values = [{color: “red”}, {color: “blue”}, {color: “red”, number: 2}]; var withoutDuplicates = removeDuplicatesBy(x => … Read more
Just assign to an instance: static from(json){ return Object.assign(new Student(), json); } So you can do: const student = Student.from({ name: “whatever” }); Or make it an instance method and leave away the assignemnt: applyData(json) { Object.assign(this, json); } So you can: const student = new Student; student.applyData({ name: “whatever” }); It could also be … Read more
This works: <html> <head></head> <body> <object type=”text/html” id=”htmlFrame” style=”border: none;” standby=”loading” width=”100%”></object> <script type=”text/javascript”> var element = document.getElementById(“htmlFrame”); element.setAttribute(“data”, “attributeValue”); </script> </body> </html> If you put this in a file, open in it a web browser, the javascript will execute and and the “data” attribute + value will be added to the object element. Note: … Read more
If you’re running with jQuery you can use the datepicker UI library’s parseDate function to convert your string to a date: var d = $.datepicker.parseDate(“DD, MM dd, yy”, “Sunday, February 28, 2010”); and then follow it up with the formatDate method to get it to the string format you want var datestrInNewFormat = $.datepicker.formatDate( “mm/dd/yy”, … Read more
No. Alternatively you could accept a lambda as an argument, which also gives you full control in which part of the “creation” process will be called. This way you can call it like: MyClass instance = MyClass.FactoryCreate(c=> { c.SomeProperty = something; c.AnotherProperty = somethingElse; }); The create would look similar to: public static MyClass FactoryCreate(Action<MyClass> … Read more
Because toArray() creates an array of Object, and you can’t make Object[] into DataObject[] just by casting it. toArray(DataObject[]) creates an array of DataObject. And yes, it is a shortcoming of the Collections class and the way Generics were shoehorned into Java. You’d expect that Collection<E>.toArray() could return an array of E, but it doesn’t. … Read more