In angular.js, there are some code snippets use !! to check whether a value is truthy in if condition.

Is it a best practice? I fully understand in return value or other assignment !! is used to make sure the type is Boolean. But is it also true for condition checks?

if (!!value) {

  element[name] = true;

  element.setAttribute(name, lowercasedName);

} else {

  element[name] = false;

  element.removeAttribute(lowercasedName);

}