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Implement two string utility functions | xAI Interview Question

Implement two string utility functions

Last updated: Apr 2, 2026

Quick Overview

This question evaluates proficiency in string manipulation and text processing, including character counting, tokenization by spaces, case-sensitive comparisons, and preserving original word order.

xAI

Jan 17, 2026, 12:00 AM

Data Engineer

Technical Screen

Coding & Algorithms

Implement the following Python functions:

number_of_character(string, char)
- Return the number of times character char appears in string .
- Matching should be case-sensitive.
- Example: number_of_character("Today is Tuesday", "t") should return 2 .
unique_string(msg1, msg2)
- Split each input message into words using spaces.
- Return the words that appear in msg1 but not in msg2 , followed by the words that appear in msg2 but not in msg1 .
- Preserve original order.
- Use case-sensitive comparison.
- Example:
  - msg1 = "This is the first message"
  - msg2 = "Hello this is the second message"
  - Output: ["This", "first", "Hello", "this", "second"]

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