Lesson 40: Mastering JavaScript Map and Set with challenges!
May 27, 2025 · 6 min read · 🔷 Map: Keyed Collections With Any Data Type A Map stores key–value pairs, like an Object, but: Keys can be of any type: object, number, boolean, NaN, etc. Maintains insertion order. Has a clean, iterable API. const map = new Map(); map.set('na...
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