https://yonatankarp.github.io/tags/gotchas/Recent content in Gotchas on Yonatan Karp-RudinHugoenFri, 02 Dec 2022 00:00:00 +0100https://yonatankarp.github.io/blog/break-hashmap-less-than-a-minute/Fri, 02 Dec 2022 00:00:00 +0100https://yonatankarp.github.io/blog/break-hashmap-less-than-a-minute/<blockquote> <p><strong>TL;DR:</strong> Never use mutable objects as keys in your HashMap!</p> </blockquote> <p>After I wrote my article <a href="https://yonatankarp.com/how-does-hashmap-work-in-java"><strong>How does HashMap work in Java?</strong></a>, a few people suggested more topics related to HashMap. As a result, I decided to create a short series of articles about it.</p> <p>In today&rsquo;s article, we will discuss JVM HashMaps and how they can be easily broken if not used carefully. It&rsquo;s important to note that while we&rsquo;ll be focusing on the JVM world, the same principles apply to most modern programming languages.</p>