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Showing content from https://github.com/sindresorhus/dot-prop/issues/109 below:

deepKeys works wrong for sparsed arrays · Issue #109 · sindresorhus/dot-prop · GitHub

deepKeys should not return not existed keys

it("deepKeys should return correct values for sparsed arrays", () => {
  // fixture setup
  // eslint-disable-next-line no-sparse-arrays
  const mockedData = [1, , 3];

  const expectedState = Object.keys(mockedData).map(k => `[${k}]`);

  const sut = () => deepKeys(mockedData);

  // exercise system
  const actualResult = sut();

  // verify outcome
  expect(actualResult).toEqual(expectedState);
});

- Expected  - 0
+ Received  + 1

  Array [
    "[0]",
+   "[1]",
    "[2]",
  ]Jest

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