not equal sign not working in javascript -

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this question has answer here:

i using not equal sign convert false true giving false. have tried 0 , 1 working fine. when changing value "false" "true" working problem "false" only.

<script type="text/javascript"> var test= "false"; alert(!test) </script>

you assigning string "false", assign boolean false

var test = false; alert(!test);

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