JavaScript Equality Table

Posted by pdq on Wednesday March 26, 2014 @02:39PM
from the dorey.github.io dept.

http://dorey.github.io/JavaScript-Equality-Table/

( 4 comments | 19 points | on HN )

Re:JavaScript Equality Table by Gepser on Wednesday March 26, 2014 @06:42PM (#7477184)

It's funy that "true==[[]]" is false but "false==[[]]" is true. Maybe someone could explain why "[[]]" is considered false?

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Re:JavaScript Equality Table by program on Thursday March 27, 2014 @04:29AM (#7479184)

If you write ([[]] == false) you compare values of this object. Internally a [[]].toString() is called which gives an empty string (cause the first element is also an empty array) which in turn is considered false in javascript.

Otherwise [[],[]] is true cause cause [[],[]].toString() gives you this string: ",".

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Re:JavaScript Equality Table by dzderic on Wednesday March 26, 2014 @08:34PM (#7477757)

Even better, [1] == 1 but [1] != [1]

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Re:JavaScript Equality Table by dllthomas on Wednesday March 26, 2014 @06:45PM (#7477201)

If "false == X" is true, shouldn't we expect that "true == X" is false?

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