Coerces oObject to boolean. If it was falsey (e.g. 0, null, undefined, etc.), it will be false, otherwise, true.
!oObject //Inverted boolean
!!oObject //Non inverted boolean so true boolean representationSo !! is not an operator, it's just the ! operator twice.
Real World Example "Test IE version":
let isIE8 = false;
isIE8 = !! navigator.userAgent.match(/MSIE 8.0/);
console.log(isIE8); // returns true or false If you ⇒
console.log(navigator.userAgent.match(/MSIE 8.0/));
// returns either an Array or null but if you ⇒
console.log(!!navigator.userAgent.match(/MSIE 8.0/));
// returns either true or false
manpreet![Tuteehub forum best answer]()
Best Answer
2 years ago
I saw some code that seems to use an operator I don't recognize, in the form of two exclamation points, like so:
!!. Can someone please tell me what this operator does?The context in which I saw this was,