Convert any value to Boolean.
There are only two Boolean value true and false. But some time we need to convert string to Boolean. So today I will show how to convert any value to Boolean.
Let see when we console log any string value it will show as bellow -
console.log("Human")
Human
console.log(!!"Human")
true
So we understand that Using !! in front of any value we can convert the value to Boolean
It is same as Boolean() function. See the following examples -
console.log(!!"Human")
true
console.log(!!1)
true
console.log(!!0)
false
console.log(!!"") // false
console.log(!!" ") // true
console.log(!!undefined)
false
console.log(!!NaN)
false
console.log(!!null)
false
console.log(!!true)
true
So it is the same and short form of Boolean().