Wipro Technical Support Engineer Interview Questions and Answers

Closure is a programming concept that allows a function to access variables from its parent scope even after the parent function has finished executing.

• Closure is created when a nested function references a variable from its outer function.

• The inner function can access and modify the variables from the outer function.

• Closure helps in encapsulating data and creating private variables in JavaScript.

• It allows functio...read more

The map method is used to create a new array by applying a function to each element of an existing array.

• The map method takes a callback function as an argument.

• The callback function is executed on each element of the array.

• The result of the callback function is added to the new array.

• The map method does not modify the original array.

• Example: ['apple', 'banana', 'cherry'].map(fruit => fruit.toUpperCase()) returns ...read more

JavaScript is a programming language used to add interactivity and dynamic features to websites.

• JavaScript is a client-side scripting language.

• It is primarily used for web development.

• JavaScript can be embedded directly into HTML pages.

• It allows for the manipulation of webpage elements and handling of events.

• Common uses include form validation, creating interactive content, and AJAX requests.

A promise in JavaScript is an object representing the eventual completion or failure of an asynchronous operation.

• Promises are used to handle asynchronous operations such as fetching data from a server or reading a file.

• They provide a cleaner and more readable way to write asynchronous code compared to using callbacks.

• Promises have three states: pending, fulfilled, or rejected.

• They can be chained using the then() ...read more

To troubleshoot system slowness, check for resource usage, run diagnostic tools, update software, and optimize settings.

• Check CPU, memory, and disk usage to identify any bottlenecks

• Run diagnostic tools like Task Manager, Resource Monitor, or Performance Monitor

• Update software and drivers to ensure compatibility and performance

• Optimize system settings such as startup programs, background processes, and power settin...read more

DNS, DHCP, networking, troubleshooting, and Active Directory are all related to managing and troubleshooting network services and infrastructure.

• DNS (Domain Name System) is responsible for translating domain names into IP addresses.

• DHCP (Dynamic Host Configuration Protocol) is used to automatically assign IP addresses to devices on a network.

• Networking involves the design, implementation, and management of compute...read more