OodlesTechnologies React Developer Interview Questions, Process, and Tips

Basic aptitude asked for all company

One question to find substring of string which has double chars

Q1. Basic oops and sql
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Q2. Write pandas for dataframe
Ans. 
Pandas is a Python library used for data manipulation and analysis, including creating and working with dataframes.
• Import the pandas library: import pandas as pd

• Create a dataframe: df = pd.DataFrame(data)

• Accessing data in a dataframe: df['column_name']

• Filtering data in a dataframe: df[df['column_name'] > value]

• Adding a new column: df['new_column'] = values
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Q1. Give angle betweeen hour hand and min hand art 12:20
Ans. 
The angle between the hour hand and minute hand at 12:20 is 10 degrees.
• Calculate the angle made by the hour hand from 12 o'clock position: (20/60)*30 = 10 degrees

• Calculate the angle made by the minute hand from 12 o'clock position: (20/60)*360 = 120 degrees

• Find the difference between the two angles: 120 - 10 = 110 degrees
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Q2. Basic operating system questions
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Pseudocode problems and 2 coding questions

Q1. Introduction, family background, logical question of English alphabet
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Q1. AI/ML trends, bitcoin info
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Q2. Java code for finding even number
Ans. 
Java code to find even numbers in an array
• Iterate through the array and check if each element is divisible by 2

• Use the modulus operator (%) to check for even numbers

• Store the even numbers in a separate array or print them out
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Q3. Basic questions about technologies mentioned in the resume
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Q1. Intro, family background
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Q2. HTML, CSS, JAVA, CPP code
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Q3. Logical Questions
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Q4. Speaking Communication
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CSS Positioning Questions, Data fetching in React Questions , Asked about CORS Errors

Design a full frontend page ..

Q1. Basic questions about your technology
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Q1. About your salary expectation
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Q1. How are you ?
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Q2. What is teamwork for you ?
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Q1. What is oop concept
Ans. 
OOP (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data and code.
• OOP focuses on creating objects that interact with each other to solve problems

• Encapsulation: Objects can hide their internal state and require interaction through methods

• Inheritance: Objects can inherit attributes and methods from parent objects

• Polymorphism: Objects can take on different forms o
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Q1. JWT authentication and authorisation.
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Q1. Run tasks on Code Sandbox
Ans. 
Code Sandbox allows running tasks for front-end development
• Open Code Sandbox and create a new project

• Add necessary dependencies and files

• Run tasks using npm scripts or command line

• Examples: build, start, test
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Pattern question has been provided to me

Q1. Write html code for form
Ans. 
HTML code for a basic form
• Use the <form> tag to create a form

• Include <input> tags for user input fields

• Use <button> tag for submit button
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Q2. Difference between candidate key and foreign key
Ans. 
Candidate key uniquely identifies a record in a table, while foreign key establishes a relationship between two tables.
• Candidate key is a unique key that can be used to uniquely identify a record in a table.

• Foreign key is a key that establishes a relationship between two tables.

• Candidate key can be a primary key or a unique key, while foreign key references a primary key in another table.

• Example: In a 'students' table,...read more
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