var arr = [{
id: 1,
name: "a"
}, {
id: 1,
name: "b"
}, {
id: 2,
name: "c"
}, {
id: 2,
name: "d"
}];
implementation result:
arr = [{
id: 1,
name: ["a", "b"]
}, {
id: 2,
name: ["c", "d"]
}];
could you tell me how to achieve this?
my sentence is a bit less readable, for reference:
arr.reduce ((mjournal c) = > [m.find (x = > x.id=c.id) .name.push (c.name), m] [1], Array.from (new Set (arr.map (n = > n.id)), m = > new Object ({id:m,name: []});
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