Traveloka Software Engineering Lead Interview Questions and Answers

Data structures and algo. 2 ques were asked in hackerrank

Q1. Questions related to System design
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Q1. Basic question related to Spring and Java
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Q1. What is polymorphism?
Ans. 
Polymorphism is the ability of a function or method to behave differently based on the object it is acting upon.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: Inheritance allows a child class to override a method from its parent class, exhibiting polymorphic b
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Q2. How abstraction is implemented?
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Abstraction is implemented in software engineering by hiding unnecessary details and exposing only relevant information.
• Abstraction is achieved through the use of abstract classes and interfaces in object-oriented programming.

• It allows developers to focus on the essential aspects of a concept without getting bogged down in implementation details.

• For example, in a car simulation program, the Car class may have abstract ...read more
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Q3. What is the difference between abstraction and Interface?
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Abstraction is hiding the implementation details while Interface is a contract that defines the methods that a class must implement.
• Abstraction focuses on hiding the internal implementation details of a class, allowing the user to only see the necessary details.

• Interface defines a contract that specifies the methods a class must implement, without providing the implementation details.

• Abstraction can be achieved through...read more
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Q1. What is your motivation when you are working on same project alone for long period?
Ans. 
My motivation when working on a project alone for a long period is the satisfaction of seeing my hard work come to fruition.
• Setting small achievable goals to keep myself motivated

• Taking breaks to avoid burnout and maintain productivity

• Seeking feedback from others to stay motivated and improve my work

• Reminding myself of the end goal and the impact my project will have
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Q1. What is your salary expectation?
Ans. 
My salary expectation is based on my experience, skills, and the market rate for Software Engineers in this region.
• Research the average salary range for Software Engineers in the specific region or industry

• Consider your level of experience, skills, and qualifications when determining your salary expectation

• Be prepared to negotiate based on the company's offer and benefits package
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There were 3 coding questions totally based on dsa- hard

Q1. Vertical Traversal
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Q2. Find the node with shortest distance
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Use Dijkstra's algorithm to find the node with the shortest distance in a graph.
• Implement Dijkstra's algorithm to calculate the shortest distance from a starting node to all other nodes in the graph.

• Select the node with the smallest distance that has not been visited yet as the current node.

• Update the distances of neighboring nodes from the current node if the new distance is smaller than the previously recorded distan...read more
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Q1. Question based on oops
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Q2. Question based on OS
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Q1. What is the difference between normal and arrow functions
Ans. 
Arrow functions are more concise and have a lexical 'this' binding compared to normal functions.
• Arrow functions do not have their own 'this' keyword, they inherit it from the parent scope.

• Arrow functions do not have their own 'arguments' object.

• Arrow functions cannot be used as constructors with 'new'.

• Arrow functions are more concise and have implicit return when no curly braces are used.
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Q2. All basic JS Questions to cover Hoisting closure
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Q3. They asked to show me an example using the API call
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Q4. Difference between forEach and Map
Ans. 
forEach is used to iterate over an array and perform a function on each element, while map creates a new array by applying a function to each element.
• forEach does not return a new array, while map does

• forEach does not modify the original array, while map creates a new array

• forEach is used for side effects, while map is used for transformation

• Example: forEach - array.forEach(item => console.log(item)), map - const newAr
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Psuedocode and 10 aptitude codes ,pure maths.fill the blank type

First 2 basic code-i.Pattern ii.Fibnocii ,after clearing two then three will be 3 coding question-Standard Leetcode and GFG questions

Q1. You need to Design Sql table mapping based on scenerio
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Q1. About DSA,SQL,BASED ON UR RESSUME
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Q1. ABOUT LOCATION AND PACKAGE
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Q1. Find nth elements from last in linked list
Ans. 
Use two pointers to find the nth element from the end of a linked list.
• Use two pointers, one moving n steps ahead of the other

• When the first pointer reaches the end, the second pointer will be at the nth element from the end
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Q2. Difference between hashmap and concurrent hashmap
Ans. 
HashMap is not thread-safe while ConcurrentHashMap is thread-safe and allows concurrent access.
• HashMap is not thread-safe and can lead to ConcurrentModificationException if accessed by multiple threads simultaneously.

• ConcurrentHashMap allows concurrent access by multiple threads without the need for external synchronization.

• ConcurrentHashMap achieves thread-safety by dividing the map into segments, allowing multiple th...read more
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Write code to return the maximum profit by buying and selling stocks using available money