The maps package

The maps package has been part of the standard Go library since Go 1.21 and offers functions for maps of any type—its use is illustrated in mapsPackage.go.

The mapsPackage.go program uses two helper functions that are defined as follows:

func delete(k string, v int) bool {
    return v%2 != 0
}
func equal(v1 int, v2 float64) bool {
    return float64(v1) == v2
}

The purpose of the delete() function is to define which pairs are going to be deleted from the map—this function is called as a parameter to maps.DeleteFunc(). The current implementation returns true for all odd values. This means that all odd values along with their keys are going to be deleted. The first parameter of delete() has the data type of the keys of the map whereas the second one has the data type of the values of the map.

The purpose of the equal() function is to define how the equality of the values of the two maps is defined. In this case, we want to compare int...