Most Frequent Element

Working With Arrayshard

Course · Section 11: Working With Arrays · Lecture 156: Data Transformations: map, filter, reduce

Implement `mostFrequent(arr)` returning the element that appears most often. On a tie, return the one that reaches the highest count first.

Input: mostFrequent(["a","b","a","c","b","a"])

Output: "a"

Input: mostFrequent([1,2,2,3])

Output: 2

+ 1 hidden test run on Submit.

Common pitfalls

Using >= for the best-count comparison flips the tie-break to the later element.

Approach & explanation (try first)

Counting while scanning and updating the best only on a strictly higher count returns the element that first reaches the maximum frequency.

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