JavaScript: Double Equal Operator

• The double equal operator == can be used to test equality of Primitive Value of the same type.
• WARNING: If left-hand-side and right-hand-side are of different type, it does a type conversion first, often resulting unexpected result.

TIP: never use double equal. Use Triple Equal Operator instead.

console.log([] == "");
console.log("0" == 0);
console.log("" == 0);
console.log(1 == true);