Deep equals on array of functions does not work as expected

[alidcast]

The following code returns false:

    let q = new Queue()
    q.add(1, 'string', function () { })
    let removed = q.remove(3)
    expect(removed).to.deep.equal([1, 'string', function () { }])

But if I run it without the functions, it returns true.

The failed message reads:

expected [ 1, 'string', [Function] ] to deeply equal [ 1, 'string', [Function] ]

[meeber]

Hi @alidcastano. I think you're running into the same issue as described in #697. Essentially, functions are checked for referential equality, so function () {} isn't considered deeply equal to function () {}. The conversation in #697 goes into more detail about why it is that way, but here are two examples that demonstrate it:

it("same function", function () {
  let noop = function () {};

  expect([1, 'string', noop]).to.deep.equal([1, 'string', noop]);  // passes
});

it("different functions", function () {
  expect([1, 'string', function () {}]).to.deep.equal([1, 'string', function () {}]);  // fails
});

[alidcast]

That definitely explains it, thanks.