Reverse Prefix of Words #interviewquestions #pythoninterviewquestions #dataengineers #faangquestion

Python Question 83: Reverse Prefix of Words

Video 251: In this video, we are given a string word and a character ch, reverse the segment of word that starts at index 0 and ends at the index of the first occurrence of ch (inclusive). If the character ch does not exist in word, do nothing.

We tackle the problem of reversing a segment of a string based on the first occurrence of a specific character. We'll explore two different Python approaches to solve this problem efficiently. Follow along to understand the logic behind each approach and see the code in action.

*** Approach 1: Using find() and String Slicing ***
In this method, we utilize the find() function to locate the first occurrence of the character. We then slice the string up to and including that character, reverse it, and concatenate it back with the remaining part of the string. This approach is simple and leverages Python's string slicing capabilities.

*** Approach 2: Using index() and reversed() Function ***
This approach checks if the character is in the string and then uses the index() function to find its position. The reversed() function is used to reverse the segment up to and including the character. Finally, the reversed segment is concatenated with the remaining part of the string. This method demonstrates the use of list manipulation for reversing the string segment.

Both approaches efficiently solve the problem by finding the first occurrence of the character and reversing the segment accordingly. Whether you prefer string slicing or list manipulation, both methods offer a clear and concise solution.

For a comprehensive understanding and practical demonstration, be sure to watch the entire video. Happy coding!

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