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arrReduce.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
let arr = [
{ id: 1, name: 'Alice', age: 20 },
{ id: 2, name: 'Bob', age: 21 },
{ id: 3, name: 'Charlie', age: 20 },
{ id: 4, name: 'David', age: 22 },
{ id: 5, name: 'Eve', age: 23 },
{ id: 6, name: 'Frank', age: 24 },
{ id: 7, name: 'Frank', age: 24 }
];
console.log(Object.values(arr.reduce((acc, item) => {
if (!acc[item.age]) acc[item.age] = [item];
else acc[item.age].push(item);
return acc;
}, {})).filter(value => value.length > 1));
let result = Object.values(arr.reduce((acc, item) => {
if (!acc[item.age]) acc[item.age] = [item];
else acc[item.age].push(item);
return acc;
}, {})).filter(value => value.length > 1).flat();
console.log(result);
</script>
</body>
</html>