Gateway for Preparing Interviews
What are the alternatives to inheritance? Delegation is an alternative to inheritance. Delegation denotes that you include an instance of any class as an instance variable, and forward messages to the instance. It is safer than inheritance because it ceases you to think about forwarded message , because the instance is of a known class, … Read more
Explain anova() function. The anova() function is used for comparing the nested models. Explain aggregate() function. The aggregate() function is used to aggregate data in R. There are two methods which are collapsing data by using one or more BY variable and other is an aggregate() function in which By variable should be in the … Read more
What is B2B ? B2B stands for Business-to-business. What does application client module contain? The application client module contains: class files, and an application client deployment descriptoor. Application client modules are packaged as JAR files with a .jar extension What is “application assembler”? A person who combines J2EE components and modules into deployable application units. … Read more
How many threads run in React Native? The React Native app contains the following thread: React Native UI Thread (Main Thread): This thread is used for the layout of the mobile app. React Native JavaScript Thread: It is a thread where our business logic will run. It means JS thread is a place where our JavaScript code … Read more
What is Query Builder in Laravel? Laravel’s Query Builder provides more direct access to the database, alternative to the Eloquent ORM. It doesn’t require SQL queries to be written directly. Instead, it offers a set of classes and methods which are capable of building queries programmatically. It also allows specific caching of the results of … Read more
What are the different data types in Tableau? Tableau expresses fields and assigns data types automatically. If the data source appoints the data type, Tableau will use that data type. If the data source doesn’t individually assign a data type, Tableau will assign one. Tableau consist of the following data types: Date values Text values … Read more
What is the difference between final, finally and finalize final” is the keyword to declare a constant AND prevents a class from producing subclasses. “finally” is a block of code that always executes when the try block is finished, unless System.exit() was called. “finalize()” is an method that is invoked before an object is discarded by the … Read more
What is the syntax of the Robots Meta tag? The syntax of a Robots Meta tag is very simple: <meta name=?robots? content=?instructions for crawler?> In the syntax, you can add different values or parameters of robots meta tags as a placeholder as we have written: “instructions for the crawler” as a placeholder. Some commonly used … Read more
What can I buy with Bitcoins? We can purchase anything with bitcoins that are legally sold in the world like clothing, electronics, food and art to handmade crafts. Bitcoin can also be used to buy large items like cars, real estate, and investment vehicles such as precious metals. If you buy anything from Amazon through … Read more