How to iterate an Objects values and replace undefined with null using lodash?

Question

I know how to do this using native Object.entries and a reducer function. But is it possible to replace that with a lodash function?

const object = {
  foo: 'bar',
  baz: undefined,
}

const nulledObject = Object.entries(object).reduce(
  (acc, [key, value]) => ({
    ...acc,
    [key]: typeof value === 'undefined' ? null : value,
  }),
  {}
);

// {
//   foo: 'bar',
//   baz: null,
// }

My desire would be something like:

_cloneWith(object, (value) => (typeof value === 'undefined' ? null : value));

Your code creates a whole new object on each iteration of .reduce(), copying all properties accumulated so far. Instead you could just set acc[key] as necessary and return acc. — Pointy
– Pointy, Commented Jul 7, 2021 at 22:55

Barmar · Accepted Answer · 2021-07-07 23:08:07Z

4

I think _.assignWith is what you're looking for:

const nulledObject = _.assignWith({}, object, 
    (_, value) => typeof value == 'undefined' ? null : value);

answered Jul 7, 2021 at 23:08

Barmar

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Comments

Benjamin · Accepted Answer · 2021-07-07 23:27:40Z

3

I found another solution after posting this question:

const nulledObject = _.mapValues(object, 
    (value) => (value === undefined ? null : value));

answered Jul 7, 2021 at 23:27

Benjamin

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