import ( "github.com/hashicorp/terraform/terraform" ) // create two instances of ResourceState state1 := terraform.ResourceState{} state2 := terraform.ResourceState{} // set some dummy diff data state1.Diff = map[string]*terraform.ResourceAttrDiff{ "attr1": &terraform.ResourceAttrDiff{ Old: "1", New: "2", }, } state2.Diff = map[string]*terraform.ResourceAttrDiff{ "attr2": &terraform.ResourceAttrDiff{ Old: "3", New: "4", }, } // merge the diffs state1.MergeDiff(state2) // state1 now has both diffs fmt.Printf("%v", state1.Diff)In this example, we create two instances of ResourceState with some dummy diff data. We then use MergeDiff to merge the diff fields of state1 and state2. Finally, we print out the merged diff for state1. This method can be useful when implementing custom Terraform providers or when working with the Terraform state file directly.