Checking for only null or undefined can be done like so: if (value == null) . Mind the == operator that coerces. If you check like this if (value === null || value === undefined) , you forgot/don’t know how Javascript coerces.
Read moreIS null check in JavaScript?
Javascript null is a primitive type that has one value null. JavaScript uses the null value to represent a missing object. Use the strict equality operator ( === ) to check if a value is null . The typeof null returns ‘object’ , which is historical bug in JavaScript that may never be fixed.
Read moreHow do you check if JavaScript object is null and undefined?
Answer: Use the equality operator ( == ) In simple words you can say a null value means no value or absence of a value, and undefined means a variable that has been declared but no yet assigned a value.
Read moreIS null == in JavaScript?
The JavaScript specification says about null : null is a primitive value that represents the intentional absence of any object value . If you see null (either assigned to a variable or returned by a function), then at that place should have been an object, but for some reason, an object wasn’t created.
Read moreIS null object in JavaScript?
null is not an object, it is a primitive value . For example, you cannot add properties to it. Sometimes people wrongly assume that it is an object, because typeof null returns “object” . But that is actually a bug (that might even be fixed in ECMAScript 6).
Read more