Trawex Technologies Senior IOS Developer Interview Questions and Answers

Q1. Promises in javascript
Ans. 
Promises in JavaScript are objects representing the eventual completion or failure of an asynchronous operation.
• Promises are used to handle asynchronous operations in JavaScript.

• They can be in one of three states: pending, fulfilled, or rejected.

• Promises can be chained using .then() to handle success and .catch() to handle errors.
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Q1. Resume based questions
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Q2. Event loop in nodejs
Ans. 
Event loop in Node.js manages asynchronous operations by executing callback functions when certain events occur.
• Event loop is responsible for handling I/O operations, timers, and callbacks in Node.js

• It allows Node.js to perform non-blocking operations efficiently

• Event loop continuously checks the event queue for new events to execute
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Q3. Javascript es6 questions
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Q1. Let var const difference
Ans. 
var, let, and const are all used to declare variables in JavaScript, but they have different scopes and mutability.
• var is function-scoped and can be redeclared and reassigned

• let is block-scoped and can be reassigned but not redeclared

• const is block-scoped and cannot be reassigned or redeclared
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Q2. Polyfills of bind method
Ans. 
Polyfills of bind method provide a way to use the bind method in older browsers that do not support it natively.
• Polyfill code typically checks if the bind method is available and if not, it creates a new function that mimics the behavior of bind.

• One common polyfill for the bind method is the following: Function.prototype.bind = Function.prototype.bind || function() { // polyfill code here };

• Polyfills are often used to ...read more
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Q1. Make a search bar in React
Ans. 
Create a search bar component in React for filtering data
• Create a functional component for the search bar

• Use state to store the search query

• Implement a onChange event handler to update the search query

• Filter the data based on the search query
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Q2. React js core concepts
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Q1. How you structure your work
Ans. 
I structure my work by breaking down tasks, setting priorities, creating timelines, and regularly reviewing progress.
• Break down tasks into smaller, manageable chunks

• Set priorities based on deadlines and importance

• Create timelines to track progress and ensure timely completion

• Regularly review progress and adjust plans as needed
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Q2. How you make a project from scratch
Ans. 
To make a project from scratch, start by defining requirements, creating a plan, designing the architecture, implementing the code, testing, and deploying.
• Define project requirements and goals

• Create a project plan with timelines and milestones

• Design the architecture of the project, including database schema and system components

• Implement the code following best practices and coding standards

• Test the project thoroughly ...read more
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Coding Test included communication test, apti and reasoning and coding.

Q1. SQL- Based Question
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Q2. HTML Question
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Q1. Javascript Question
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Q2. Thinking ability question
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Q1. How to detect Android location
Ans. 
Android location can be detected using LocationManager and LocationListener classes.
• Create an instance of LocationManager class

• Check if location services are enabled

• Request location updates using LocationListener class

• Implement onLocationChanged() method to get location updates

• Use getLastKnownLocation() method to get last known location

• Add necessary permissions in AndroidManifest.xml file
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Q2. How to work on maps
Ans. 
Maps can be worked on using Google Maps API or other third-party libraries.
• Choose a map provider and obtain an API key

• Integrate the API into your app

• Add markers, polylines, and polygons to the map

• Implement location tracking and geocoding

• Customize the map's appearance and behavior
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Q1. When can you join US
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Q1. Go through Swift. Ord doc and keep the concept clear and should be sufficient enough to crack the interview. Prepare some string based coding problems. Also can ask you about implementing protocols and sim...read more
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