Nim variants and json

parsing_from_json.nim

import json

type
  Kind = enum
    kFoo, kBar

  Baz = object
    name: string
    case kind: Kind
    of kFoo: iAge: int
    of kBar: sAge: string

let foo = Baz(name: "Fred", kind: kFoo, iAge: 23)
let bar = Baz(name: "Sally", kind: kBar, sAge: "22")

let sjfoo = $(%*(foo))
let sjbar = $(%*(bar))
let foo2 = parseJson(sjfoo).to(Baz)
let bar2 = parseJson(sjbar).to(Baz)

echo sjfoo, " => ", $foo2
echo sjbar, " => ", $bar2

# Output
# nim 1.0.6
# {"name":"Fred","kind":"kFoo","iAge":23} => (name: "Fred", kind: kFoo, iAge: 0)
# {"name":"Sally","kind":"kBar","sAge":"22"} => (name: "Sally", kind: kBar, sAge: "")
# nim 1.2.0
# {"name":"Fred","kind":"kFoo","iAge":23} => (name: "Fred", kind: kFoo, iAge: 23)
# {"name":"Sally","kind":"kBar","sAge":"22"} => (name: "Sally", kind: kBar, sAge: "22")