rjhilgefort
1/24/2018 - 10:51 PM

`mergeWith` omit `undefined`

Ramda merge that doesn't treat undefined as a value that should override the first object.

mergeWithOmitNil.js
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const omitNil = curry((x, y) =>
  cond([
    [ where({ y: isNotNil }), prop('y') ],
    [ T, prop('x') ]
  ])({ x, y })
);

mergeWith(omitNil, { foo: 'foo', bar: 'bar' }, { bar: undefined });
// { foo: 'foo', bar: 'bar' }