Logical NOT on Boolean Object always return false in Javascript -

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• why !new boolean(false) equals false in javascript? 2 answers

why logical not operator in javascript returns different result between boolean value , boolean object? consider following example.

!true  // false !false // true  !(new boolean(true))  // false !(new boolean(false)) // false 

from spec, says value being evaluated converted toboolean. toboolean return true if argument object, , return if argument boolean.

digging further, toboolean being used in other places if statement , conditional operator, consider following example:

var = (new boolean(false)) ? "unexpected" : "expected"; console.log(a); // unexpected 

the question: boolean object object, or boolean? should not evaluate boolean object boolean?

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update

my question marked duplicate question this. question doesn't have satisfactory answers because none answers question, is boolean object object, or boolean? should not evaluate boolean object boolean?

simply knowing boolean object object not enough, why exists , proper way of dealing and/or designing objects boolean object still left unanswered.

an object, no matter if has properties or not, never defaults false...

new boolean(true) return object not boolean , !{} going false {} truthy value (boolean({}) evaluated true)

while dealing boolean factory function, not create new instance using new (as create new instance of boolean , return object)

boolean(input) return primitive-boolean value of specified expression used comparison

from docs, the boolean object object wrapper boolean value()

description: the value passed first parameter converted boolean value, if necessary. if value omitted or 0, -0, null, false, nan, undefined, or empty string (""), object has initial value of false. other values, including object or string "false", create object initial value of true.

do not confuse primitive boolean values true , false true , false values of boolean object.

any object value not undefined or null, including boolean object value false, evaluates true "when passed conditional statement."[reference]

for example, condition in following if statement evaluates true

var x = new boolean("false");  if (x) {    console.log('x true');  }    var y = new boolean(false);  if (y) {    console.log('y true');  }

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