Every value has truth or false values in JavaScript. For example, a null value has an associated _boolean _value of false. Similarly 34 has an associated value of true. We can use this to cast a variable to trueor false using the double bang operator.

Let’s dive deep into what it is and how it works.

The ! in JavaScript, also called bang, is the logical “not” operator. If you place this operator in front of a _boolean _value, it will reverse the value, returning the opposite.

!true // returns false
!false // returns true

isTrue = true // variable which is boolean
!isTrue // returns false

If the single bang returns the opposite _boolean _value, imagine what double-bang would return?

The associated boolean value. In other words, true or false according to whether it is truthy or falsy values.

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