uTrade Solutions Interview Questions and Answers

Use border-radius property in CSS to convert rectangle to circle.

• Set the border-radius property to 50% to make a rectangle into a circle.

• Make sure the width and height of the element are equal for a perfect circle.

• Example: .circle { width: 100px; height: 100px; border-radius: 50%; }

Closure in JavaScript is the combination of a function and the lexical environment within which that function was declared.

• Closure allows a function to access variables from its outer scope even after the outer function has finished executing.

• It is created whenever a function is defined within another function.

• Closure helps in maintaining state in asynchronous operations.

Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during the compilation phase.

• Hoisting applies to both variable and function declarations.

• Variable declarations are hoisted but not their initializations.

• Function declarations are fully hoisted, including their definitions.

• Hoisting can lead to unexpected behavior if not understood properly.

Methods of array are built-in functions that can be used to manipulate arrays in JavaScript.

• Some common methods include push(), pop(), shift(), unshift(), splice(), slice(), concat(), indexOf(), and includes().

• push() - adds elements to the end of an array

• pop() - removes the last element from an array

• shift() - removes the first element from an array

• unshift() - adds elements to the beginning of an array

• splice() - adds or removes elements from a specific index in an array

• slice()...read more

OOPs pillars are the four main principles of Object-Oriented Programming: Inheritance, Encapsulation, Abstraction, and Polymorphism.

• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Abstraction: Hiding the complex implementation details and showing only the necessary features of an object.

• Polymorphism: Ability to present the same interface for different data ty...read more