How is the bucket determined for an element added to a map?

In Go, hashing the key is used to determine the bucket (or bin) in a map. When you add an element to a map, the key goes through a hash function that converts it into a numerical value. This value is then used to select the bucket where the key-value pair will be stored.

The process roughly looks like this:

1. The hash of the key is computed.
2. Based on the hash, the index of the bucket is determined (usually by taking the modulus with the number of buckets).
3. The element is placed into the corresponding bucket.

This allows for efficient lookup of elements by key with an amortized access time close to O(1).