Merging maps is a common operation when working with configuration data, combining results from multiple sources, or aggregating information. The simplest approach is to iterate over each map and copy key-value pairs into a new destination map. If a key exists in both maps, the second map’s value will overwrite the first.
Starting with Go 1.21, the maps package includes a Copy() function that provides a cleaner way to copy one map into another. For basic merging needs, the loop approach is straightforward and has been available since the beginning of Go.