Remove all null and undefined properties from an object

JavaScript version
const removeNullUndefined = (obj) => Object.entries(obj).reduce((a, [k, v]) => (v == null ? a : ((a[k] = v), a)), {});
// Or
const removeNullUndefined = (obj) =>
Object.entries(obj)
.filter(([_, v]) => v != null)
.reduce((acc, [k, v]) => ({ ...acc, [k]: v }), {});
// Or
const removeNullUndefined = (obj) => Object.fromEntries(Object.entries(obj).filter(([_, v]) => v != null));
Examples
removeNullUndefined({
foo: null,
bar: undefined,
fuzz: 42,
}); // { fuzz: 42 }