Coditas Technologies Interview Questions and Answers

Javascript, css, angular and HTML

JS, angular and HTML

Q1. What will you handle pressure?
Ans. 
I handle pressure by staying organized, prioritizing tasks, and maintaining open communication with team members.
• Staying organized by creating to-do lists and setting realistic deadlines

• Prioritizing tasks based on deadlines and importance

• Maintaining open communication with team members to delegate tasks and ask for help when needed
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Q2. Manager was telling about the project.
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Q1. Pillars of OOPS.
Ans. 
OOP is based on four main pillars: Encapsulation, Abstraction, Inheritance, and Polymorphism, which enhance code organization and reusability.
• Encapsulation: Bundling data and methods that operate on the data within one unit (class). Example: A class 'Car' with attributes like 'speed' and methods like 'accelerate()'.

• Abstraction: Hiding complex implementation details and showing only the essential features. Example: A 'P...read more
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Q2. Bssic Coding Questions
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Q3. Abstract class and Interface
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Q4. Basic coding Question
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Q5. What are diamond problems
Ans. 
Diamond problems occur in object-oriented programming when multiple inheritance leads to ambiguity in method resolution.
• Occurs in languages like C++ where a class inherits from two classes that have a common base class.

• Example: Class A is a base class, Class B and Class C inherit from A, and Class D inherits from both B and C.

• Ambiguity arises when Class D tries to access a method from Class A, as it's unclear which pat...read more
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Q1. Upload doc and preview button functionality- explain the approach
Ans. 
Implementing document upload and preview in React involves file input handling and rendering previews based on file type.
• Use an <input type='file'> element to allow users to select documents.

• Utilize FileReader API to read the file and generate a preview.

• Handle different file types (e.g., images, PDFs) with conditional rendering.

• Implement state management (e.g., using useState) to store the selected file.

• Example: ...read more
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Q2. UseRef hooks questions
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Q3. React fibre and reconciliation
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Q4. Analog clock using react
Ans. 
Create an analog clock in React using state and CSS for styling.
• Use React's useState and useEffect hooks to manage time updates.

• Create a Clock component that renders the clock face and hands.

• Calculate the angles for the hour, minute, and second hands based on the current time.

• Use CSS transforms to rotate the clock hands appropriately.

• Set an interval to update the clock every second.
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Q5. Webpack and vite difference
Ans. 
Webpack is a module bundler, while Vite is a build tool that focuses on speed and modern development experience.
• Webpack bundles JavaScript modules, while Vite serves files directly during development for faster refresh.

• Vite uses native ES modules in the browser, allowing for on-demand loading, whereas Webpack bundles everything upfront.

• Webpack requires configuration for various features, while Vite offers sensible defa...read more
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Q6. Optimization techniques
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Q7. New features in react 19
Ans. 
React 19 introduces new features enhancing performance, developer experience, and concurrent rendering capabilities.
• Automatic Batching: React 19 allows automatic batching of updates, improving performance by reducing the number of renders.

• New Suspense Features: Enhanced support for Suspense, allowing for better handling of asynchronous data fetching.

• Concurrent Rendering Improvements: Further optimizations for concurren...read more
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Q8. Difference between useState and useRef
Ans. 
useState manages state and triggers re-renders; useRef holds mutable values without causing re-renders.
• useState is used for state management, while useRef is used for accessing DOM elements or storing mutable values.

• useState triggers a re-render when the state changes, whereas useRef does not trigger re-renders.

• Example of useState: const [count, setCount] = useState(0);

• Example of useRef: const inputRef = useRef(null);

• u...read more
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Q9. Difference between context and redux
Ans. 
Context is for simpler state management, while Redux is a more robust solution for complex state management in React applications.
• Context API is built into React, while Redux is a separate library.

• Context is suitable for light state management, whereas Redux is ideal for large applications with complex state.

• Context can lead to performance issues if not used carefully, while Redux provides optimized performance through...read more
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Q1. Flattening Json
Ans. 
Flattening JSON involves transforming nested JSON structures into a simpler, one-dimensional format.
• Use libraries like `json_normalize` in Python to flatten JSON. Example: `pd.json_normalize(data)`.

• Flattening can be done by concatenating keys. For example, `{ 'a': { 'b': 1 } }` becomes `{ 'a_b': 1 }`.

• Consider using AWS Glue for ETL processes to flatten JSON data in data lakes.

• In JavaScript, you can use recursion to fla...read more
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Q2. SQL Queries like window function and rank
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Q1. Create a DAG to execute python script parallely
Ans. 
Create a Directed Acyclic Graph (DAG) to execute Python scripts in parallel.
• Define tasks for each Python script to be executed in parallel

• Use a parallelism parameter to specify the number of tasks to run concurrently

• Set up dependencies between tasks to ensure proper execution order

• Use a DAG scheduler like Apache Airflow to manage and execute the DAG
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Q2. SQL Queries like window function
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Q1. Python code to find repeated numbers and their concurrency
Ans. 
Python code to find repeated numbers and their concurrency
• Iterate through the array and use a dictionary to store the count of each number

• Iterate through the dictionary to find numbers with count greater than 1 and their concurrency
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Q2. SQL Joins and Optimization
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Q1. Project Worked on and brief overview
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Q2. Technologies worked on
Ans. 
I have worked on a variety of technologies including Python, SQL, Hadoop, Spark, and AWS.
• Python

• SQL

• Hadoop

• Spark

• AWS
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Q3. Rate in skills out of 5
Ans. 
Rate in skills out of 5
• Programming: 5

• Data Analysis: 4

• Database Management: 4

• Machine Learning: 3
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Q1. What transformation done in project
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Q2. Explain explode function
Ans. 
Explode function is used to split a string into an array of strings based on a delimiter.
• The explode function takes in a delimiter and a string as input

• It splits the string into an array of strings based on the delimiter

• For example, explode(',', 'apple,banana,orange') would return ['apple', 'banana', 'orange']
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Q3. Python question to convert string to dictionary
Ans. 
Convert a string representation of a dictionary into an actual Python dictionary using eval or ast.literal_eval.
• Use `eval()` for simple cases: `dict_str = '{"key": "value"}'` -> `my_dict = eval(dict_str)`.

• Prefer `ast.literal_eval()` for safety: `import ast; my_dict = ast.literal_eval(dict_str)`.

• Ensure the string is properly formatted: keys and values should be in quotes.

• Handle exceptions: use try-except to catch err...read more
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Q4. Spark coding question to flatten a Json
Ans. 
Flattening JSON in Spark involves transforming nested structures into a simpler, flat format for easier analysis.
• Use Spark's DataFrame API to read JSON data: `spark.read.json('path/to/json')`.

• Utilize the `explode` function to flatten arrays: `df.withColumn('flattened', explode(df.arrayColumn))`.

• For nested JSON, select fields using dot notation: `df.select('nested.field1', 'nested.field2')`.

• Combine multiple flattening t...read more
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Q5. Persist, cache and unpersist in pyspark
Ans. 
Persist, cache, and unpersist manage data storage in PySpark for performance optimization.
• Persist: Stores DataFrame in memory/disk for faster access. Example: df.persist()

• Cache: A shorthand for persist with MEMORY_ONLY storage level. Example: df.cache()

• Unpersist: Removes DataFrame from memory/disk. Example: df.unpersist()

• Use persist/cache for iterative algorithms to avoid recomputation.

• Choose appropriate storage level ...read more
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Q1. Java script questions with example
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Q2. React native architecture
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Q1. Coding problem based on string manipulation
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Q2. React native questions
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The first round was group discussion; which was conducted by an institution referring candidates to the company. I was shortlisted.

The next round was also conducted by the company itself, and it was group discussion again, it went well. I believe there were around 12 candidates in one batch, and I was shortlisted. And I got the selection mail for the final technical interview, but then they call me and say I'm kept on hold and never contacted me.

Q1. I was kept on hold thus i never got the chance of attending the interview.
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