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What is the difference between null and undefined in JavaScript?
The value 'undefined' denotes that a variable has been declared, but hasn't been assigned any value. On the other hand, Javascript null refers to a non-existent object, which basically means 'empty' or 'nothing'. They're both values usually used to indicate the absence of something . Also, undefinedRead more
The value ‘undefined’ denotes that a variable has been declared, but hasn’t been assigned any value. On the other hand, Javascript null refers to a non-existent object, which basically means ’empty’ or ‘nothing’. They’re both values usually used to indicate the absence of something . Also, undefined and null are two distinct types: undefined is a type itself (undefined) while null is an object .