lodash groupBy condition on params - lodash

Question

I'm trying to convert this with lodash..... or maybe ES7
[
{
"name":"Rue Pierre",
"details":{
"name":"Rue Pierre"
}
},
{
"name":"Rue de Wavrin",
"details":{
"ref":"D 241",
"name":"Rue de Wavrin"
}
},
{
"name":"Rue de paris",
"details":{
"ref":"D 241",
"name":"Rue de paris"
}
}
]
in
{
"Rue Pierre": [
{ "name": "Rue Pierre", "details": { "name": "Rue Pierre Gilles de Gennes" }}
],
"D 241': [
{"name": "Rue de paris", "details": {"ref": "D 241", "name": "Rue de paris"}},
{"name": "Rue de Wavrin", "details": { "ref": "D 241", "name": "Rue de Wavrin" }}
]
}
If the property 'ref" exist i groupBy "ref" else groupBy "name".
It's possible in one step?
Thx

Answer 1

_.groupBy() accepts a predicate. In the predicate you can use _.get() to get the value of a path ('details.ref') from the object, and if the value is undefined use a default value (o.name) instead.
const data = [{"name":"Rue Pierre","details":{"name":"Rue Pierre"}},{"name":"Rue de Wavrin","details":{"ref":"D 241","name":"Rue de Wavrin"}},{"name":"Rue de paris","details":{"ref":"D 241","name":"Rue de paris"}}];
const result = _.groupBy(data, (o) => _.get(o, 'details.ref', o.name));
console.log(result);
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