Is NaN equal to NaN?

Question

parseFloat(\"NaN\")

returns \"NaN\", but

parseFloat(\"NaN\") == \"NaN\"

returns false. Now, that\'s probably a go

Answer 1

• When Number (returned by ParseFloat) compares with string string converted to Number
• NaN is not equal to any other object ( including NaN)

You get NaN==NaN . It is false by second rule.