In simple terms, undefined is a variable with no assigned value and it has no data type either. Now, let us see its difference with an undefined option. If you look at the end, the empty string has a string while the null feature has an object option.

Let us explain it through an example: var myVar = null – Null ObjectĪlthough this string too defines a value of nothing, it still has a type of data object option.

Confused? Let us show you an example: – Empty String var myVar = “ “ Īs you can see, it is still a string.

Is an empty string really empty? Not really. An Extra Method for JavaScript Test for Empty Stringĭifferences Between Empty, Null, and Undefined.How To Check for Empty String Javascript by Boolean Option.How To Check for Empty String Javascript by Comparison Operator.How To Check for Empty String Javascript by Length Property.Length Property in JavaScript Empty String.How To Check for Empty String JavaScript, Null, and Undefined.Differences Between Empty, Null, and Undefined.

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