Filter Nested Arrays

nested.js

const arr = [
    [{ id : 1, name: "a" },{ id : 2, name: "b" }],
    [{ id : 3, name: "c" },{ id : 4, name: "d" }]
] 

const filteredArr = arr.reduce((a,b) => a.concat(b))
            .filter((obj) => obj.id === 3);

console.log(filteredArr)