Reverse Prefix of Word
Below is the step-by-step approach and code to reverse the segment of the given word that starts at index 0 and ends at the index of the first occurrence of the character ch
.
Understanding the Problem
You are given a string word
and a character ch
. You need to reverse the segment of word
that starts at index 0 and ends at the index of the first occurrence of ch
. If ch
does not exist in word
, return word
as it is.
Solution Approach
- Find the First Occurrence of
ch
: Use thefind
method to get the index of the first occurrence ofch
inword
. Ifch
is not found, returnword
unchanged. - Reverse the Segment: If
ch
is found, reverse the segment ofword
from index 0 to the found index (inclusive). - Concatenate with the Remaining Part: Join the reversed segment with the remaining part of
word
. - Return the Result: Return the resulting string.
Here’s the code:
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Key Takeaways
- We have used the
find
method to locate the index of the first occurrence ofch
. - We have reversed the desired segment of the string using slicing and joined it with the remaining part.
- The code ensures that if
ch
is not found, no reverse operation is performed, andword
is returned unchanged.
This code meets the problem’s constraints and requirements, providing a clear solution to reverse the specified segment of the given word.