double logical not javascript
n1 = !!true // !!truthy returns true
n2 = !!{} // !!truthy returns true: any object is truthy...
n3 = !!(new Boolean(false)) // ...even Boolean objects with a false .valueOf()!
n4 = !!false // !!falsy returns false
n5 = !!"" // !!falsy returns false
n6 = !!Boolean(false) // !!falsy returns falsejavascript operator double not
// convert to boolean
// The following examples are the only values which result in a false expression
!!0 // false
!!"" // false
!!null // false
!!undefined // false
!!NaN // falsedouble javascript
<!DOCTYPE html>
<html>
<body>
<h2>JavaScript Numbers</h2>
<p>Numbers can be written with or without decimals:</p>
<p id="demo"></p>
<script>
var x = 3.14;
var y = 3;
document.getElementById("demo").innerHTML = x + "<br>" + y;
</script>
</body>
</html>Copyright © 2021 Codeinu
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