Appy Pie IOS Developer Interview Questions and Answers

Aptitude test

Current affairs

Q1. Puzzle , sql related questions
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Q1. React js, ReactHooks, es67 features, bootstrap
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60mintues DSA level coding exam

Q1. What are channels in GoLang? difference between buffered and unbuffered channels? write a program to send and receive data over channels
Ans. 
Channels in GoLang facilitate communication between goroutines, enabling synchronization and data exchange.
• Channels are typed conduits for sending and receiving values between goroutines.

• Unbuffered channels block the sender until the receiver is ready, ensuring synchronization.

• Buffered channels allow sending a limited number of values without an immediate receiver.

• Example of unbuffered channel: 'ch := make(chan int)'.

• E...read more
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Q2. What are circuit breakers in microservices
Ans. 
Circuit breakers prevent cascading failures in microservices by stopping calls to failing services temporarily.
• Circuit breakers monitor service calls and track failures.

• They have three states: Closed, Open, and Half-Open.

• In the Open state, requests are blocked to prevent further strain on a failing service.

• After a timeout, the circuit breaker enters Half-Open to test if the service has recovered.

• Example: If a payment s...read more
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The interviewer asked about javascript basics and DSA questions and some typescript questions

It was mostly on JavaScript

Q1. Focused on react
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Q1. Brief about project
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Cover topics like closures, classes, functions

Q1. Explain call bind apply
Ans. 
Call, bind, and apply are methods used to manipulate the value of 'this' in JavaScript functions.
• Call: Invokes a function with a specified 'this' value and arguments provided individually.

• Example: func.call(thisArg, arg1, arg2)

• Bind: Creates a new function that, when called, has a specified 'this' value and arguments provided one by one.

• Example: var newFunc = func.bind(thisArg, arg1, arg2)

• Apply: Invokes a function with ...read more
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Q2. Explain closures
Ans. 
Closures are functions that have access to variables from their containing scope even after the scope has closed.
• Closures allow functions to access variables from their outer function even after the outer function has finished executing.

• They help in maintaining state in asynchronous operations.

• Closures are commonly used in event handlers and callbacks.
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Aptitude test was easy but difficult

Q1. Technical questions linked list
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Q2. Array binary search Dp
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