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 }