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In a recent post on http://wtfjs.com/. An author writes following without explanation which happens to be true.
0 === -0 //returns true
My understanding about === operator is it returns true if operands point to same object.
Also, – operator returns a reference to negative value of operand. With this rule, 0 and -0 should not be the same.
So, why is 0 === -0 ?
In fact, 0 and -0 are not the same even at the bit level. However, there is a special case implemented for +/-0 so they compare as equal.
The === operator compares by value when applied to primitive numbers.