Web Reference: Oct 28, 2025 · JavaScript is unique to have two nullish values: null and undefined. Semantically, their difference is very minor: undefined represents the absence of a value, while null represents the absence of an object. The Concept of Data Types In programming, data types is an important concept. To be able to operate on variables, it is important to know something about the type. Without data types, a computer cannot safely solve this: Jun 5, 2024 · It's a primitive value that denotes the absence of a value or serves as a placeholder for an object that isn't present. `null` differs from `undefined`, which signifies a variable that has been declared but hasn't been assigned a value.
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