JavaScript basic data types do not include

JavaScript (JS for short) is a front-end programming language that is widely used in web development, mobile application development, game development and other fields. It is an interpreted language with basic data types, operators, functions, objects and other features. However, JavaScript's basic data types do not include all possible data types. This article will discuss these data types that are not included in JavaScript's basic data types.

JavaScript Basic Data Types

In JavaScript, the basic data types include Number, String, Boolean, Null, and Undefined. A brief introduction is given below:

• Number type (Number): represents numerical values, including integers and floating point numbers (numeric values ​​with decimal points).
• String type (String): represents a string of text data, which must be wrapped in single quotes or double quotes.
• Boolean value type (Boolean): represents true or false, there are only two values: true and false.
• Null value type (Null): represents a null value.
• Undefined type (Undefined): represents an undefined value.

In addition to these five basic data types, JavaScript also provides an object type (Object) for representing complex data structures. An object is composed of an unordered set of properties, each containing a key and a value.

Data types not included in JavaScript basic data types

1. Large numbers

In JavaScript, numeric types can represent integers and floating point numbers, but for Large numbers (such as 1e1000) cannot be represented accurately. This is because JavaScript uses the IEEE 754 standard to represent numbers, which can only represent a limited number of precise numbers. When the number exceeds this range, it becomes infinity (Infinity) or NaN (not a number).

If you need to accurately represent large numbers, you can use third-party libraries, such as BigInt.js, big-number, etc.

2. Fraction

There is no fraction type in JavaScript, but you can use a rational number library (such as Fraction.js) to handle fractions.

3. Byte stream

Although there is a string type in JavaScript that can be used to process text data, there is no native byte stream type. If you need to process binary data, you can use an ArrayBuffer object to process byte streams.

4. Date Time

In JavaScript, date and time can be represented by date objects (Date). However, date objects in JavaScript are not perfect. It has time zone issues and accuracy issues, and datetime calculations are difficult to do.

In order to solve these problems, you can use third-party libraries, such as moment.js, etc.

5. Image

In JavaScript, there is no native image type. But you can use the Canvas element to draw images on the page, or use third-party libraries to process images, such as JS Image, Jimp, imagemagick, etc.

Summary

JavaScript is a powerful programming language, but its basic data types do not cover all possible data types. This does not mean that it does not have the ability to handle these types, but that it needs to rely on third-party libraries or other means to achieve it. In order to better respond to business needs, we need to decide whether to use third-party libraries or other means to process corresponding data types based on specific circumstances.

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