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Grokking the Coding Interview Patterns in JavaScript

Solution: First Unique Character in a String

Discover how to identify the first unique character in a string by efficiently tracking character occurrences with a hash map. This lesson teaches you to implement a solution with optimal time and constant space complexity, helping you solve a common coding interview problem effectively.

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Statement

For a given string of characters, s, your task is to find the first non-repeating character and return its index. Return −1-1 if there’s no unique character in the given string.

Constraints:

  • 1≤1 \leq s.length ≤103\leq 10^{3} ...