Synechron Interview Questions, Process, and Tips

View model in Android is a class that stores and manages UI-related data in a lifecycle-conscious way.

• View model survives configuration changes and is not destroyed when the UI is destroyed.

• It is used to separate the UI controller logic from the UI layout.

• View model is typically used with LiveData to update the UI when the data changes.

• It helps in organizing and handling data for the UI efficiently.

Data class requires at least one parameter in primary constructor to ensure each instance of the class is unique.

• Primary constructor parameters are used to initialize properties in data class.

• Data classes are designed to hold data, so having at least one parameter ensures uniqueness of instances.

• Without parameters, instances of data class would be identical and defeat the purpose of data class.

Framework is a structure that provides guidelines for automation testing. Collection interface is a set of classes and interfaces for storing and manipulating data. TestNG, Cucumber, and Rest Assured are popular tools for automation testing.

• Framework is a reusable set of guidelines, coding standards, concepts, and practices that provide structure for automation testing.

• Collection interface in Java is a framework that p...read more

Finding duplicate values in an array of strings

• Iterate through the array and store each element in a hash set

• If an element is already in the hash set, it is a duplicate

• Return the duplicate values found

Generators in JavaScript are functions that can be paused and resumed, allowing for asynchronous programming.

• Generators are defined using function* syntax.

• They use the yield keyword to pause execution and return a value.

• Generators can be iterated over using a for...of loop.

• They are commonly used for asynchronous operations and managing state.

Flatten an array without using inbuilt functions

• Create a recursive function to iterate through the array elements

• Check if each element is an array, if so, call the function recursively

• Concatenate the elements into a new array

HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.

• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to find the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• Retrieving a value involves hashing the key to find the...read more

Using Streams API to find occurrence of each element in an array of strings

• Use Arrays.stream() to convert the array to a stream

• Use Collectors.groupingBy() to group elements by their occurrences

• Use Collectors.counting() to count the occurrences of each element

Double check locking is a design pattern used to prevent multiple threads from creating multiple instances of a singleton class.

• Create a private static instance variable with volatile keyword to ensure visibility across threads

• Use synchronized block inside if condition to check and create instance only once

• Check instance again inside synchronized block to prevent race condition

• Example: private static volatile Singleto...read more