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743天前const groupBy = (arr, key) => {
return arr.reduce((prev, curr) => {
(prev[curr[key]] = prev[curr[key]] || []).push(curr);
return prev;
}, {});
}
const arr = [
{ id: 1, name: "Alice", age: 20 },
{ id: 2, name: "Bob", age: 18 },
{ id: 3, name: "Charlie", age: 20 }
];
const result = groupBy(arr, "age");
console.log(result);
/*
{
"18": [{ id: 2, name: "Bob", age: 18 }],
"20": [
{ id: 1, name: "Alice", age: 20 },
{ id: 3, name: "Charlie", age: 20 }
]
}
*/