Get the differences from one side instead of both?

[Pikachews]

Is there a way to get the different between left and right but only returning the field of one side? e.g.

A = {
    changedField: "value1",
    unchangedField: "test"
}

B = {
    changedField: "value2",
    unchangedField: "test"
}

A.Diff(B) = {
    changedField: "value2"
}

[weichch]

By default the diff is generated in jsondiffpatch format which has both old and new values when property value changes.

You can implement your own formatter to convert the default delta into any format. One built-in example is JsonPatchDeltaFormatter.