20+ Ideas2IT Technologies Interview Questions and Answers

Functional interface is an interface with only one abstract method. Load balancing is used to distribute workload.

• Functional interface is used in lambda expressions in Java.

• Load balancing is used to distribute workload across multiple servers.

• Server side load balancing is done by a load balancer that sits between the client and server.

• Client side load balancing is done by the client application itself.

• Load balancing improves performance, availability, and scalability of appli...read more

Functional interface is an interface with only one abstract method. Benefits include lambda expressions and improved code readability.

• Functional interface allows for the use of lambda expressions, which can simplify code and improve readability.

• It also enables the use of method references, which can make code more concise.

• Functional interfaces are used extensively in Java 8's Stream API.

• Transaction uses include ensuring data consistency and atomicity.

• Propagation levels includ...read more

The question is unclear and seems unrelated to software development.

• Ask for clarification on the question.

• Transactional levels and propagation labels are related to database transactions.

• Substring duplicates counts can be solved using string manipulation.

• It is unclear how these two topics are related.

Different isolation levels in transactions and their purpose.

• Isolation levels determine how transactions interact with each other.

• READ UNCOMMITTED: Allows dirty reads, can cause phantom reads.

• READ COMMITTED: Prevents dirty reads, but allows non-repeatable reads.

• REPEATABLE READ: Prevents dirty and non-repeatable reads, but allows phantom reads.

• SERIALIZABLE: Prevents all three types of reads, but can cause deadlock.

• Purpose is to balance data consistency and concurrency.

To estimate total cars in Chennai, consider population, vehicle ownership, public transport usage, and road infrastructure.

• Research population of Chennai

• Estimate vehicle ownership rate

• Consider public transport usage

• Assess road infrastructure

• Use statistical models to arrive at an estimate

XGBoost is a popular machine learning algorithm known for its speed and performance, with various hyperparameters to tune for optimal results.

• XGBoost hyperparameters include max_depth, learning_rate, n_estimators, subsample, colsample_bytree, and more

• max_depth controls the maximum depth of each tree in the ensemble

• learning_rate determines the step size shrinkage used to prevent overfitting

• n_estimators specifies the number of boosting rounds or trees to build

• subsample controls...read more

Different metrics used to evaluate Classification Problems

• Accuracy

• Precision

• Recall

• F1 Score

• ROC-AUC

• Confusion Matrix

Feature selection methods include filter methods, wrapper methods, and embedded methods.

• Filter methods: Select features based on statistical measures like correlation, chi-squared test, or information gain.

• Wrapper methods: Use a specific machine learning algorithm to evaluate the importance of features by selecting subsets of features.

• Embedded methods: Feature selection is integrated into the model training process, like Lasso regression or decision trees.

• Principal Component ...read more

Chi-square test is commonly used for testing categorical features.

• Chi-square test is used to determine if there is a significant association between two categorical variables.

• It is commonly used in market research, biology, and social sciences.

• Example: Testing if there is a relationship between gender and voting preference.

Creating a number plate using a multidimensional array of strings.

• Create a 2D array of strings to represent the number plate

• Use loops to populate the array with the required characters

• Print the array to display the number plate

Arrow functions are shorter syntax for writing function expressions. They have lexical 'this' binding.

• Arrow functions do not have their own 'this', 'arguments', 'super', or 'new.target' keywords.

• Arrow functions cannot be used as constructors and do not have a prototype property.

• Arrow functions are anonymous and cannot be named.

• Arrow functions have a shorter syntax compared to normal functions.

• Arrow functions have a lexical 'this' binding, meaning they inherit the 'this' value...read more

Binary sort algorithm implementation in JavaScript for sorting an array of strings.

• Convert the array of strings to lowercase for case-insensitive sorting.

• Implement the binary search algorithm to find the correct position for each element.

• Use the Array.splice() method to insert the element at the correct position in the sorted subarray.

The wrong label on the boxes can cause confusion and errors in the software development process.

• Ensure proper labeling of boxes to avoid confusion

• Double check labels before using them in the development process

• Communicate with team members to clarify any discrepancies in labeling

The man crossing a bridge question is a classic logic puzzle that involves determining the time it takes for different people to cross a bridge.

• The puzzle typically involves multiple people with different walking speeds.

• The goal is to figure out the minimum amount of time it takes for everyone to cross the bridge.

• One common variation is the 'Torch and Bridge' puzzle where a torch is needed to cross the bridge and only two people can cross at a time.

Random Forest is an ensemble learning algorithm that builds multiple decision trees and merges them together to get a more accurate and stable prediction.

• Random Forest is a popular algorithm used for both classification and regression tasks.

• It creates multiple decision trees during training and combines their predictions to improve accuracy.

• Random Forest is less prone to overfitting compared to a single decision tree.

• Each decision tree in the Random Forest is trained on a ran...read more

Java 8 introduced new features for working with collections, such as streams and lambda expressions.

• Java 8 introduced the Stream API for processing collections in a functional style.

• Lambda expressions can be used to iterate over collections and perform operations on elements.

• The Collectors class provides utility methods for collecting elements into a new collection.

• Parallel streams can be used to process collections concurrently for improved performance.

DB partitioning involves dividing a large database into smaller, more manageable parts.

• Identify key columns for partitioning

• Choose a partitioning strategy (range, list, hash, etc.)

• Implement partitioning using database-specific tools or commands

• Monitor and optimize partitioning for performance

Python is a versatile and easy-to-learn programming language commonly used for web development, data analysis, and automation.

• Python is known for its readability and simplicity, making it a great choice for beginners.

• It supports multiple programming paradigms, including procedural, object-oriented, and functional programming.

• Python has a large standard library and a thriving community, providing access to a wide range of tools and resources.

• Popular frameworks like Django and ...read more

Debouncing in React is a technique used to limit the number of times a function is called in a specified time frame.

• Debouncing helps in improving performance by reducing unnecessary function calls.

• It is commonly used in scenarios like search bars where we want to wait for user to finish typing before making an API call.

• Example: Using lodash debounce function to delay API call until user stops typing.