TELUS Digital Front end Developer Interview Questions and Answers

Coding test was the first round of interview

Q1. What is virtual dom in react and what makes it faster ?
Ans. 
Virtual DOM is a lightweight copy of the actual DOM in React, allowing for efficient updates and rendering.
• Virtual DOM is a representation of the actual DOM in memory.

• React compares the virtual DOM with the actual DOM to identify changes.

• Only the differences between the virtual and actual DOM are updated, making it faster.

• Example: When a user interacts with a React component, the virtual DOM is updated first before the
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Q1. It was HR round
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Strictly know about advanced coding languages like python.

Be focus on aptitude and reasoning too....

Q1. Union and union all difference
Ans. 
UNION combines the results of two or more SELECT statements, while UNION ALL includes duplicates.
• UNION removes duplicate rows, while UNION ALL retains all rows including duplicates

• UNION is slower than UNION ALL as it performs a distinct operation

• UNION requires the same number of columns in the SELECT statements, while UNION ALL does not have this restriction
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Q2. What is generic and non-generic collections

Ans. 

Generic collections allow storing any type of data, while non-generic collections are type-specific.

• Generic collections can store any type of data, such as List or Dictionary.

• Non-generic collections are type-specific, like ArrayList or HashTable.

• Generic collections provide type safety and better performance compared to non-generic collections.

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