What's The Difference Between Double Exclamation Operator And Boolean() In Javascript?

I know that !!variable will convert variable into a boolean value and the function Boolean(), according to the ecma262 spec, will also perform a type conversion by calling ToBoolea

Solution 1:

They are the same, as the ! operator will call ToBoolean() internally on its operand, and then flip that returned value, while Boolean() will call ToBoolean() internally on its argument.