Unisis Engineering Interview Questions and Answers

A palindrome is a word, phrase, number, or other sequence of characters that reads the same forward and backward.

• Create a function that takes a string as input

• Reverse the string and compare it to the original string

• If they are the same, it is a palindrome

• Ignore spaces and punctuation when comparing

Sets in Tableau are custom groupings of dimensions or measures, while groups are predefined groupings of dimensions.

• Sets are dynamic and can be created based on conditions or filters, while groups are static and predefined.

• Sets can be used for creating custom segments or categories, while groups are typically used for organizing data into predefined categories.

• Examples: A set could be created to group customers who made a purchase in the last 30 days, while a group could be u...read more

Use distributed computing systems like Hadoop or Spark to process large amounts of data efficiently.

• Utilize distributed computing systems like Hadoop or Spark

• Break down the data into smaller chunks for parallel processing

• Use data compression techniques to reduce storage and processing overhead

• Consider using cloud-based solutions for scalability and cost-effectiveness

LOD expressions in Tableau are Level of Detail expressions that allow you to compute values at different levels of granularity.

• LOD expressions can be used to calculate values at the level of detail of the visualization, regardless of the dimensions in the view.

• They can be written using FIXED, INCLUDE, or EXCLUDE keywords to specify the level of detail.

• For example, you can use an LOD expression to calculate the total sales for a specific product category, regardless of other d...read more

Asynchronous ajax should be used when you want to make a request without blocking the rest of the code execution.

• Use asynchronous ajax when you need to fetch data from a server without pausing the execution of other scripts

• It is useful when you want to update parts of a webpage dynamically without reloading the entire page

• Asynchronous ajax is commonly used in web applications to improve user experience by loading data in the background

Program to find and remove duplicate strings in an array

• Create an empty hash table

• Iterate through the array and add each string to the hash table

• If a string already exists in the hash table, remove it from the array

Some major design patterns used include Singleton, Factory, Observer, and Strategy patterns.

• Singleton pattern ensures a class has only one instance and provides a global point of access to it.

• Factory pattern creates objects without specifying the exact class of object that will be created.

• Observer pattern defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.

• Strategy pattern defines a ...read more

Test strategy for launching Amazon app

• Define test objectives and scope

• Identify target devices and platforms

• Create test cases for functional and non-functional requirements

• Perform compatibility testing with different devices and OS versions

• Conduct security and performance testing

• Ensure seamless integration with other Amazon services

• Perform user acceptance testing

• Implement continuous testing and monitoring

• Collaborate with development and product teams for bug fixes and improvem...read more