iQGateway Interview Questions and Answers

Q1. What is closure?
Ans. 
Closure is a function that has access to its own scope, as well as the outer scope in which it was defined.
• Closure allows a function to access variables from an outer function even after the outer function has finished executing.

• It is created whenever a function is defined within another function, and the inner function is returned or passed as an argument.

• Closure helps in maintaining state in asynchronous operations o
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Q2. How to handle async operations in javascript?
Ans. 
Async operations in JavaScript can be handled using Promises, async/await, callbacks, and event listeners.
• Use Promises to handle asynchronous operations and chain multiple async tasks together.

• Async/await provides a more readable and synchronous way to handle asynchronous code.

• Callbacks can be used to execute code after an async operation is completed.

• Event listeners can be used to respond to asynchronous events in the
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Q1. What is the method to find the largest three numbers in an array using sorting? Self Intro
Ans. 
Sort the array and retrieve the last three elements for the largest numbers.
• 1. Sort the array in ascending order.

• Example: For array [5, 1, 9, 3], sorting gives [1, 3, 5, 9].

• 2. Access the last three elements of the sorted array.

• Example: From [1, 3, 5, 9], the largest three are [5, 9].

• 3. If the array has fewer than three elements, handle accordingly.

• Example: For array [2], return [2] as the largest number.
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Emotion Intensity was the assignment project

Q1. What are pearson and spearman coefficients? When to choose which?
Ans. 
Pearson and Spearman coefficients are measures of correlation between two variables, with Pearson being for linear relationships and Spearman for monotonic relationships.
• Pearson coefficient measures the linear relationship between two variables, while Spearman coefficient measures the monotonic relationship.

• Pearson coefficient ranges from -1 to 1, with 1 indicating a perfect positive linear relationship, 0 indicating n...read more
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Q2. Explain multi-collinearity mathematically and how it impacts the equation: y=mx+c?
Ans. 
Multi-collinearity occurs when independent variables in a regression model are highly correlated with each other.
• Multi-collinearity is a phenomenon where two or more independent variables in a regression model are highly correlated.

• It can impact the equation y=mx+c by making the estimates of the coefficients m and c less reliable.

• Multi-collinearity can lead to inflated standard errors, making it difficult to determine ...read more
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Q1. 1. 2 basic Java programs 2. Static and non static keywords 3. Can abstract class have concrete methods? 4. What is IoC? 5. Structure of linkedlist
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