A brief analysis of the new value-added comparison function object.is_javascript skills of JavaScript ES6

Before object.is, we compare values using the two equal sign "= =" or the three equal sign "= =", the three equals is more rigorous, as long as the comparison of the two types of different immediately return false.

In addition, there is and only one value is not equal to itself, it is Nan

Now ES6 added a object.is, let comparison operation of the river is more chaotic.

In most cases object.is is equivalent to "= =", as follows

1 = = 1//True
object.is (1, 1)//True
 
' a ' = = = = ' A '/true
object.is (' A ', ' a ')//true
 
= = TRUE//t Rue
Object.is (True, True)//true
 
NULL = NULL/TRUE
object.is (null, NULL)/true
 
undefined = = = Undef ined//True
object.is (undefined, undefined)/true

But for Nan, 0, +0,-0, and "= =" is different

Nan = = nan//False
object.is (Nan, Nan)//true
 
0 = = 0/True
object.is (0, -0)//False
 
-0 = +0 True
object.is ( -0, +0)//False

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