JS: Boolean Operators

x && y

and operator. Return true if both Boolean(x) and Boolean(y) are true, else false. If Boolean(x) is false, y is not evaluated. 〔see Boolean Constructor〕

// “and” operator
console.log(true && true);

x || y

or operator. Return true if one of Boolean(x) or Boolean(y) is true, else return false. If Boolean(x) is true, y is not evaluated. 〔see Boolean Constructor〕

// “or” operator
console.log(true || true);

!x

not operator. Reverse the boolean value. Return true if Boolean(x) is false, return false if Boolean(x) is true. 〔see Boolean Constructor〕

// “logical negation” operator
console.log(!false);