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JavaScript Equality Table

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

by pdq • 12 years ago

19 4 12 years ago

DO

dorey.github.io

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4

Gepser• 12 years ago

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

dllthomas• 12 years ago

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

dzderic• 12 years ago

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

program• 12 years ago

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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