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HashMaps - What they are? How they work? When to reach for them?
Hash maps in JavaScript — beginner-friendly, QA/SDET ready. In this quick lesson we turn hash maps into “super-fast labeled lockers,” then code together with JavaScript Map: has, get, set. You’ll learn when to use it for “have I seen this,” “how many times,” and “where did I see this,” plus three interview-style examples ...
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