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Description
Currently, when SortMapKeys is set to true in Config, map keys are sorted using a standard alphanumeric sort. It should be possible to specify a custom map key sorting function to use, in order to prioritize certain map keys over others.
Example: Standard SortMapKeys behavior:
cfg := jsoniter.Config{
SortMapKeys: true,
}.Froze()
m := map[string]int{
"beta": 2,
"alpha": 1,
}
output, _ := cfg.MarshalToString(m)
==> {"alpha":1,"beta":2}
Example: custom SortMapKeys behavior:
cfg := jsoniter.Config{
SortMapKeys: true,
}.Froze()
// Desired --- register an extension that defines a custom map key sorting function
cfg.RegisterExtension(...some extension...)
m := map[string]int{
"trump": "should be first",
"beta": 2,
"alpha": 1,
}
output, _ := cfg.MarshalToString(m)
// DESIRED OUTPUT
==> {"trump":"should be first","alpha":1,"beta":2}
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