Why Object.is() is better than ‘==’ and ‘===’ ?

Everybody who used JavaScript knows that JS is loosely typed and comparing with ‘==’ gives unexpected results.

So if we use triple equals operator ‘===’, we got a more strict result, but it is also not yet perfect:

For help us in this case we use ES6 ‘Object.is()’, it is more precision than ‘===’ and moreover it behaves well in some special cases:

Compare table:

Polyfill:

If you like this article, follow me on Twitter @MaciejDEV

Comments

[Manav Misra]

I had 4gotten about this. === really is 'good enough' - less typing than Object.is - Besides those edge cases, NS 😕 if it's worth it?
GTK, though. JIC.

[aqrojo]

Yes, all that tests return false when you use '==='

' ' == 0 //false
null == undefined //false
[1] == true //false

[Eduardo Zepeda]

Thank you so much for your post!

[Dinesh Balaji]

Nice post. I believe you have misplaced === code snippet with == (The second snippet)..:)