Truelancer Senior Java Developer Interview Questions and Answers

Q1. Explain hoisting in js
Ans. 
Hoisting in JavaScript is the behavior where variable and function declarations are moved to the top of their containing scope during the compilation phase.
• Variable declarations are hoisted to the top of their scope, but not their assignments.

• Function declarations are fully hoisted, meaning they can be called before they are declared.

• Hoisting can lead to unexpected behavior if not understood properly.
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Q2. Explain closures in js
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Closures in JavaScript allow functions to access variables from their outer scope even after the outer function has finished executing.
• Closures are created when a function is defined within another function and the inner function has access to the outer function's variables.

• Closures can be used to create private variables and functions in JavaScript.

• Closures can also be used to maintain state in asynchronous operations
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Q1. Javascript polyfills
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Q1. Implement Class Tree
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Q2. Level order Traversal, Zig Zag aTraversal and Puzzles
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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

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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Round duration - 60 Minutes
Round difficulty - Easy

Formal Introduction.
Asked About Projects.
Difference between SQL and NoSQL. Pros and Cons. Where should we use SQL and NoSQL.
Given a problem, I have to make a SQL Database structure and then interviewer told me to convert it into NoSQL.
asked coding questions

Q1. 
Search In Rotated Sorted Array Problem Statement
Given a sorted array of distinct integers that has been rotated clockwise by an unknown amount, you need to search for a specified integer in the array. Fo...read more
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Q2. 
Zigzag Binary Tree Traversal Problem
Given a binary tree, compute the zigzag level order traversal of the node values in the tree. The zigzag traversal requires traversing levels from left to right, then ...read more
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