ECMA-262 Core: JavaScript Null Data Type

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Introduction And Review

The ECMA-262 standard defines the term Null Type as: the type Null has exactly one value called null.

The Null data type is one of five ECMAScript primitive types. The other four are: Number, Boolean, String and Undefined. All primitive types have a definite (fixed) size except for the String type.

The Null type is distinguished from other types using a dynamic or weak typing method. The method involves interrogating the value token. The Null type can have only one value and that value is null.

Null Types


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