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Grokking the Coding Interview Patterns in JavaScript

Solution: Find the Difference

Explore how to identify the index of the extra character between two strings by applying bitwise XOR operations. Learn to optimize your solution with O(n) time and O(1) space complexity, understanding the use of bitwise manipulation to efficiently solve string comparison problems.

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Statement

Given two strings, str1 and str2, find the index of the extra character that is present in only one of the strings.

Note: If multiple instances of the extra character exist, return the index of the first occurrence of the character in the longer string.

Constraints:

  • 0≤0 \leq str1.length, str2.length ≤1000\leq 1000
  • Either str2.length == str1.length + 1, or, str1.length ==
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