Have you used the HashMap data structure in your projects?

Yes, the HashMap data structure was widely used by me in projects for efficient storage and quick access to data by key. For example, in test automation, HashMap helps store test results with unique identifiers, allowing quick retrieval and analysis of specific cases. In Java, it looks like this:

Map<String, TestResult> results = new HashMap<>();
results.put("testCase1", new TestResult(true));
TestResult result = results.get("testCase1");

HashMap provides an average access time of O(1), which significantly speeds up data search and update operations.