JavaScript provides both strict(===, !==) and type-converting(==, !=) equality comparison. The strict operators take type of variable in consideration, while non-strict operators make type correction/conversion based upon values of variables. The strict operators follow the below conditions for different types,

- Two strings are strictly equal when they have the same sequence of characters, same length, and same characters in corresponding positions.
- Two numbers are strictly equal when they are numerically equal. i.e, Having the same number value. There are two special cases in this,

- NaN is not equal to anything, including NaN.
- Positive and negative zeros are equal to one another.

- Two Boolean operands are strictly equal if both are true or both are false.
- Two objects are strictly equal if they refer to the same Object.
- Null and Undefined types are not equal with ===, but equal with ==. i.e, null===undefined --> false but null==undefined --> true