The tutorials in this series focus on new data structures in modern JavaScript, like Set, Map, WeakSet, WeakMap, Queue, Stack, Tree, Graph, Doubly Link List, Hash Table, Priority Queue, Bloom Filter, Heap, Bit Array, and more.
Although the new data structures are not as commonly used as arrays and objects (and you may not need them at all in most common projects), knowing that they exist and understanding them deeply can help you optimize performance and reduce memory usage.