JavaScript Interview Prep: Count Character Occurrences in a String (The reduce() Method)

Unlock a common JavaScript interview question! In this quick tutorial, you'll learn how to efficiently count the occurrences of every character in a given string using a powerful built-in method: Array.prototype.reduce(). We'll break down the code step-by-step, showing how reduce() iterates over the characters to build a frequency map (an object) that holds the count for each unique character. What You'll Learn: How to convert a string to an array for iteration. Mastering the reduce() method for aggregation. Creating a character frequency map (or object). A clean, one-liner solution for a popular interview problem.