JavaScript Boolean types and other types of conversions

Some of the relevant values

1, 0, ' 1 ', ' 0 ', true, false, ' true ', ' false ', Nan, ' Nan ', Undefined, ' undefined ', null, ' undefined ', ', [], {}

true = = 1//true

true = = ' 1 '//true

true = = ' true '//false, except ' 1 ', true not equal to any other string

true = = NaN//false

true = = undefined//false

true = = NULL//false

true = = '//false

true = = []//false

true = = {}//false

false = = 0//true

false = = ' 0 '//true

False = = ' false '//false, except ' 0 ', false not equal to any other string

false = = NaN//false

false = = undefined//false

false = = NULL//false

false = = '//true

false = = []//true, this is actually true

False = = {}//false

if (1)//true

if (' 1 ')//true

if (' true ')//true

if (' false ')//true

if (' NaN ')//true

if (NaN)//false

if (' undefined ')//true

if (undefined)//false

if (' null ')//true

if (null)//false

if (')//false

if ([])//true

if ({})//true

Conversion rules are not good to master, write code when the old thinking of these rules too cumbersome, and later without the if (name) such code, also do not have to = =.

JavaScript Boolean types and other types of conversions