Given a key, the hash function can suggest an index where the value can be found or stored: index = f(key, array_size) When you want to insert a key/value pair, you first need to use the hash function to map the key to an index in the hash table. The basic idea behind hashing is to distribute key/value pairs across an array of placeholders or "buckets" in the hash table.Ī hash table is typically an array of linked lists. Chaining means to create a linked list of values, the keys of which map to a certain index. This is usually done with a technique called chaining. You must account for potential collisions.Values are not stored in a sorted order. ![]() ![]() A hash function is an algorithm that produces an index of where a value can be found or stored in the hash table. It is one part of a technique called hashing, the other of which is a hash function. A hash table, also known as a hash map, is a data structure that maps keys to values.
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