Null data type javascript

Jan 30,  · var noValue = null; The undefined type can only be represented as the value undefined. JavaScript developers typically avoid programmatically setting variables to undefined. When the JavaScript engine creates a variable in memory, it sets its value to undefined until it's assigned a Tramaine Gillus. When is a variable's data type in javascript `Null`? Ask Question 3. Is it actually possible to get the Null data type as a return from the typeof function - if so what case yields that result, when is a variable actually of the Null type? The “null” value. In JavaScript null is not a “reference to a non-existing object” or a “null pointer” like in some other languages. It’s just a special value which has the sense of “nothing”, “empty” or “value unknown”. The code above states that the age is unknown or empty for some reason.

Null data type javascript

At first glance, null and undefined may seem the same, but they are far from it. If you're not familiar with data types in JavaScript, I recommend. This article attempts to list the built-in data structures available in JavaScript and what properties they have; these can be used to build other. The value null represents the intentional absence of any object value. It is one of JavaScript's primitive values.]

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JavaScript - Reference vs Primitive Values/ Types

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