Accessing nested json objects is just like accessing nested arrays. Nested objects are the objects that are inside an object literal.In the following example 'vehicles' is a object which is inside a main object called 'person'. Using dot notation the nested objects' property(plane) is accessed.Example-1Live Demo<html> <body> <script> ... Read More
Any method that is declared final in the superclass cannot be overridden by a subclass. If we try to override the final method of super class we will get an error in Java.Rules for implementing Method OverridingThe method declaration should be the same as that of the method that is to be ... Read More
Array.isArray() method is universal, it can function any where whereas instanceof operator is not universal, it can't work in new environment..syntax-1Array.isArray(array);syntax-2array instance of Array;In the following example, where there is no new environment created, both Array.isArrar() and instanceof have produced same output.ExampleLive Demo<html> <body> <script> var a ... Read More
The StringIndexOutOfBoundsException is one of the unchecked exceptions in Java. A string is kind of an ensemble of characters. String object has a range of [0, length of the string]. When someone tries to access the characters with limits exceeding the range of actual string value, this exception occurs.Example1Live Demopublic class StringDemo { public static ... Read More
In javascript, arrays are not true arrays. They are javascript objects. So when we try to know their type using typeof() operator the displayed output will be object.Syntaxtypeof(operand);parameters - typeof() operator takes an operand and returns the data type of the operand. In the following example even though variable 'a' is ... Read More
We need to follow some rules when we overriding a method that throws an Exception.When the parent class method doesn’t throw any exceptions, the child class method can’t throw any checked exception, but it may throw any unchecked exceptions.class Parent { void doSomething() { // ... } ... Read More
The java.lang.ClassCastException is one of the unchecked exception in Java. It can occur in our program when we tried to convert an object of one class type into an object of another class type.When will be ClassCastException is thrownWhen we try to cast an object of Parent class to its Child class type, this exception ... Read More
An object property can be accessed in two ways. One is .property and the other is [property].Syntax-1Object.property;Syntax-2Object["property"];For better understanding, lets' look at the following example.In the following example an object called 'person' is defined and its properties were accessed in a dot notation.ExampleLive Demo<html> <body> <script> var ... Read More
A recursive function is a function that calls itself during its execution. This enables the function to repeat itself several times, outputting the result and the end of each iteration. Recursion has something to do with infinity. Following is an example of recursive function to find the factorial of an integer.Factorial of a ... Read More
Serialisation is the process of transforming objects of complex data types to native data types so that they can then be easily converted to JSON notation. If you have a JSON string, you can convert it into a JSON string by using the json.dumps() method.Python pickle module is used for serialising ... Read More
Object.isFrozen()Object.isFrozen() method is used to find whether an object is frozen or not. An object is frozen if it followed the below criteria1) It should not be extensible.2) Its properties should be non-configurable.3) It shouldn't accept any new properties.SyntaxObject.isFrozen(obj);Parameters - Object.isFrozen() accepts an object as a parameter and scrutinizes whether it is frozen ... Read More
Before going to explain super() first we need to know about multiple inheritance concept.Multiple inheritance : Means one child class can inherit multiple parent classes.In the following example Child class inherited attributes methods from the Parent class.Exampleclass Father: fathername = "" def father(self): print(self.fathername) class Mother: ... Read More
In Java, it is possible to define a class inside another class, such classes are called Nested classes. We can use the access modifiers like private, public, protected or default for inner classes and default or public access modifiers for outer class.There are two types of nested classes are defined in ... Read More
PHP 7 has added a new operator double question mark (??) operator. In PHP 7, the double question mark(??) operator known as Null Coalescing Operator.It returns its first operand if it exists and is not NULL; otherwise, it returns its second operand. It evaluates from left to right. Null Coalescing ... Read More
It does't matter how many lines of code you write in a program. When you want to remove or delete any elements from the Python list, you have to think about the difference between remove, del and pop in Python List and which one to useremove : remove() removes the first matching value ... Read More
