null and undefined code example
Example 1: null undefined javascript
Undefined used for unintentionally missing values.
Null used for intentionally missing values.
Example 2: null + undefined
console.log(null === null); // true
console.log(undefined === undefined); // true
console.log(null + undefined === null + undefined); // false
// null + undfined equals NaN, and NaN isn't equal to itself :(