Double Equals vs Triple Equals

In JavaScript, equality can be checked using either double equals (==) or triple equals (===). But what’s the difference?

Double Equals (==)

Double equals checks for loose equality.

It compares two values after performing type coercion.

This means that if the values are not of the same type, JavaScript will try to convert one or both values to a common type before comparison.

For example, 5 == "5" will return true because the string “5” is coerced to the number 5 before comparison.

Triple equals checks for strict equality. It compares both the value and the type.

No type coercion is done, so if the values are not of the same type, the comparison will always be false.

For example, 5 === "5" will return false because the number 5 is not the same type as the string “5”.

Use == when you want to compare values and don’t care about types.

Use === when you need to ensure both value and type are the same.

As a best practice, it’s generally recommended to use === to avoid unexpected results due to type coercion.