I am currently experimenting with this code:
describe("array item removal", function () {
it("creates a gap in the array", function () {
var array = ['one','two','three'];
delete array[1]; //'two' removed
expect(array).toEqual(['one',undefined,'three']);
});
});
Despite my expectations, this test case fails. I wonder why that is happening? Shouldn't it be equal?
When working with JavaScript, it's important to note the difference between an array with 3 elements where one is undefined, and an array with only 2 elements. For instance:
var a = [1,2,3];
delete a[1];
a.forEach(function(x) { console.log(x); });
// outputs 1 3
[1,undefined,3].forEach(function(x) { console.log(x); })
// outputs 1 undefined 3
You'll also notice that:
1 in a
// returns false
1 in [1,undefined,2]
// returns true
If you explore the source code for the toEquals matcher, you'll see that it utilizes the eq function from this source file (link provided below, with the relevant part that compares objects and arrays at the end): https://github.com/jasmine/jasmine/blob/79206ccff5dd8a8b2970ccf5a6429cdab2c6010a/src/core/matchers/matchersUtil.js.
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