SingleInterface Software Developer Interview Questions and Answers

Q1. Impliment counter using closure in js
Ans. 
Implement a counter using closure in JavaScript.
• Create a function that returns another function which increments a counter variable.

• The counter variable should be defined in the outer function's scope and only accessible to the inner function.

• Each time the inner function is called, increment the counter variable and return its value.
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Q2. Explain promises, promise.all(), impliment binary search
Ans. 
Promises are objects representing the eventual completion or failure of an asynchronous operation. promise.all() is a method that takes an array of promises and returns a single promise that resolves when all of the promises have resolved.
• Promises are used in JavaScript to handle asynchronous operations.

• promise.all() takes an array of promises and returns a single promise that resolves when all promises in the array ha...read more
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Q1. Questions on kafka, cache invalidation, diff b/w authentication and authorization
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Solving normal Puzzles to test aptitude.

Sample app was asked to create.

They have their own coding platform. The questions are basically from tree.

Tree of space question

Q1. Previous round question solution
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Q2. System design was asked.
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Leecode medium level question

Leetcode Hard level Question

Q1. This is cto round asked some interview questions
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That would be online Test with 12 questions MCQ and 1 coding question. 12 MCQ questions would be related to technology and bascis, coding question would alos be basic

Q1. All Technical related, mostly related to swift ARC, Queues, Threading, unit test cases
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Q2. Concepts of memory ARC in Swift
Ans. 
Memory ARC in Swift manages memory by automatically deallocating objects when they are no longer needed.
• ARC stands for Automatic Reference Counting

• ARC keeps track of how many references exist to an object

• When the reference count drops to zero, the object is deallocated

• Weak references are used to avoid retain cycles
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Q3. Generics in Swift
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Generics in Swift allow you to write flexible, reusable functions and types that can work with any type.
• Generics enable you to write functions and types that can work with any type, without specifying the actual type until the function or type is used.

• You can define generic functions, methods, classes, structures, and enumerations in Swift.

• Example: func swapTwoValues(_ a: inout T, _ b: inout T) { let temp = a; a = b; b...read more
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Q4. MVC vs MVVM in swift
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MVC focuses on separating data, presentation, and user interaction, while MVVM adds a ViewModel to handle logic and data binding.
• MVC stands for Model-View-Controller, where the controller handles user input, the model manages data, and the view displays the data. Example: UIKit in iOS development.

• MVVM stands for Model-View-ViewModel, where the ViewModel acts as an intermediary between the model and view, handling data ...read more
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Q5. Optionals, Protocols and Delegates, LifeCycle
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An app with Login screen with authentication in MVVM

Round duration - 75 minutes
Round difficulty - Medium

Test Comprises of 3 coding questions and some MCQs

Round duration - 60 minutes
Round difficulty - Medium

2 coding questions of (1 easy and 1 medium level) on hackerrank code-pair with the Interviewer

Round duration - 60 minutes
Round difficulty - Easy

This Round was based on CS fundamentals and One coding question was there as a Code-pair.

Q1. 
Next Greater Element Problem Statement
Given a list of integers of size N, your task is to determine the Next Greater Element (NGE) for every element. The Next Greater Element for an element X is the firs...read more
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Kadance algorithm and find the middle of the linklist

More on java and Python based coding questions

Q1. Behavioural questions were asked
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Q2. What are your expectations from this job
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Q3. What are your plans ahead
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Q4. Where do you see yourself in 5 years ahead
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