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 empty?
To check if an object is empty in JavaScript:
Read moreHow do you check if a property is defined in JavaScript?
Every JavaScript object has a special method object. hasOwnProperty(‘myProp’) that returns a boolean indicating whether object has a property myProp . hero. hasOwnProperty(‘name’) returns true because the property name exists in the object hero .
Read moreHow do you know if a property is undefined?
Answer: Use the strict equality operator (===) You can use the typeof operator in combination with the strict equality operator (===) to check or detect if a JavaScript object property is undefined.
Read moreHow do you check if JavaScript object is not null?
Use the strict inequality (! ==) operator to check if a variable is not null – myVar !== null . The strict inequality operator will return true if the variable is not equal to null and false otherwise.
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 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 more