Transworld Terminals Interview Questions and Answers

Swapping bits in SQL involves using bitwise operators to manipulate binary data.

• Use bitwise XOR operator (^) to swap bits

• Example: UPDATE table SET column = column ^ 1

• Example: UPDATE table SET column = column ^ 0b1010

React.js is a JavaScript library for building user interfaces.

• React.js is a declarative, efficient, and flexible JavaScript library for building user interfaces.

• It allows developers to create reusable UI components.

• React.js uses a virtual DOM to improve performance by updating only the necessary parts of the actual DOM.

• It follows a unidirectional data flow, making it easier to understand and debug.

• React.js can be used to build single-page applications, mobile apps, and even s...read more

Hooks are a new feature in React 16.8 that allow you to use state and other React features without writing a class.

• Hooks are functions that let you use state and other React features in functional components.

• They allow you to reuse stateful logic without changing your component hierarchy.

• Examples of hooks include useState, useEffect, useContext, etc.

Program to flatten the array

• Use Array.prototype.flat() method to flatten the array

• If the array contains nested arrays, use recursion to flatten them

• Check if each element is an array before flattening

Static is a keyword used to declare a variable or method that belongs to the class. Singleton is a design pattern that restricts the instantiation of a class to one object.

• Static members are accessed using the class name, while Singleton objects are accessed using a getInstance() method.

• Static members are shared among all instances of a class, while Singleton objects are unique.

• Static members are initialized when the class is loaded, while Singleton objects are initialized wh...read more