const nested = {
id: 1,
children: [
{ id: 2 },
{ id: 3,
children: [{ id: 5 }, { id: 6 }]
},
{ id: 4 }
]
}
const flatten = function(obj) {
const array = Array.isArray(obj) ? obj : [obj];
return array.reduce(function(acc, value) {
acc.push(value);
if (value.children) {
acc = acc.concat(flatten(value.children));
delete value.children;
}
return acc;
}, []);
}
flatten(nested); // => [ { id: 1 }, { id: 2 }, { id: 3 }, { id: 5 }, { id: 6 }, { id: 4 } ]