Hello all,
I have swept through the list and gone through the pkg/encoding/json
package and _believe_ I haven't missed anything, but am not 100% sure.
When encoding structures into JSON which contain slices/arrays/maps my
frontend devs consistently complain about the encoding of empty or nil
members which they have to do a little extra work to deal with.
For example, structure is defined as:
type Foo Struct {
Bar []string
Baz map[string]int
}
if any of the members of the struct (Bar, Baz) are not initialized, or
empty the encoding is:
{
"Bar": null,
"Baz": null,
}
What they want is :
{
"Bar": [],
"Baz": {},
}
The frontend guys complain because they can't just hand that structure to
some of their libraries. I have been getting around this by defining
custom marshallers for each type which detect empty or null items and
marshal them out as '[]' and '{}' respectively. I know the other option is
to just ensure an empty map/slice/array is initialized but invoking
potential allocations and GC seems wasteful. Is there a json directive
that can be attached that tells the standard library marshaller to always
render empty items into a '[]', '{}', etc. similar to the *omitempty *
directive?
If not, would there be any support for me to propose, develop, and submit a
patch to do so?
As always, thank you all for the great work on Golang and the standard
library!
Kris
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