What happens when adding elements to a map and what is evacuation?

Adding elements to a map in Go involves several steps:

1. The hash of the key is computed.
2. Based on the hash, a bucket in the map structure is determined.
3. If there is space in the bucket, the element is added there; if not, collision resolution occurs.

Evacuation is a process related to increasing the size of the map (resize). When the map reaches a certain load, a new, larger bucket table is created. During evacuation, elements from the old buckets are gradually transferred (evacuated) to the new buckets of the new table. This is done gradually during subsequent map operations to avoid long pauses.