This is a long-standing bug in JavaScript, but since lots of codes on the web written around this behavior, and thus fixing it would create a lot more problem, so idea of fixing this issue was rejected by the committee that design and maintains JavaScript. In particular, it provides primitive types, and object types. Some types map quite directly (like String ) where others require some conversions. It's true that you can assign all sorts of different types to a variable, but JavaScript has types. js and JavaScript is crucial for correct interoperability. Typeof // Returns: "function"Īs you can clearly see in the above example when we test the null value using the typeof operator ( line no-22), it returned "object" instead of "null". JavaScript Types You might sometimes read that JS is untyped, but that's incorrect.
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typeof is the operator that let’s you determine the type of the expression: javascript. Additionally, there are functions, objects, and the special values undefined and null. A single variable can only store a single type of data. Primitive data type Non-primitive (reference) data type JavaScript is a dynamic type language, means you dont need to specify type of the variable because it is dynamically used by JavaScript engine. There are two types of data types in JavaScript. We refer to these as primitive data types. JavaScript provides different data types to hold different types of values. The five most basic types of data are strings, numbers, booleans, undefined, and null.
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The five most basic types of data are strings, numbers, booleans, undefined, and null. In JavaScript, you can find primitive types like strings, numbers, booleans, symbols. In Javascript, there are five basic, or primitive, types of data. Typeof undeclaredVariable // Returns: "undefined" In Javascript, there are five basic, or primitive, types of data.