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 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 check if JavaScript object is empty?
To check if an object is empty in JavaScript:
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.
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