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Grokking the Coding Interview Patterns in JavaScript

Solution: Intersection of Two Arrays II

Understand how to solve the intersection of two arrays problem by building a frequency map with hash maps in JavaScript. Learn to track element counts precisely and return the intersection with correct multiplicities while maintaining optimal time and space complexity.

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Statement

Given two integer arrays nums1 and nums2, return an array representing their intersection. Each element in the result should appear exactly as many times as it appears in both arrays. The result may be returned in any order.

Constraints:

  • 1≤1 \leq nums1.length, nums2.length ≤1000\leq 1000 ...