What are the built-in objects of JavaScript?

Javascript built-in objects include Math, Date, String, Array, Object, Function, RegExp, Promise, Map, Set, WeakMap, WeakSet, ArrayBuffer, TypedArray, DataView, WebAssembly, etc. Detailed introduction: 1. Math, which provides a series of mathematical constants and functions; 2. Date, which is used to process dates and times, etc.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

There are many built-in objects in JavaScript that provide developers with necessary functionality and tools. The following are some common JavaScript built-in objects:

• Math: Provides a series of mathematical constants and functions, such as Math.random()Used to generate random numbers, Math.floor() used for rounding down, etc.

• Date: Used to process dates and times. Can be used to get the current date and time, or create a specific date/time object. For example, new Date() creates an object representing the current date and time.

• String: used to process strings. Many methods are provided to manipulate strings, such as charAt() for getting the character at a specific position, indexOf() for finding the position of a specific string, toUpperCase( ) is used to convert strings to uppercase, etc.

• Array: used to process arrays. Many methods are provided to manipulate arrays, such as push() for adding elements to the end of the array, pop() for removing and returning the last element of the array, indexOf() is used to find the position of a specific element in the array, etc.

• #Object: All objects are its subclasses and provide common methods for creating objects.

• Function: used to define functions. Although it is not a built-in object, it is a key part of defining functions in JavaScript.

• RegExp: used to process regular expressions. Provides a series of functions and methods to match, find and replace patterns in strings. For example, RegExp.test() is used to check whether a string matches a regular expression.

• Promise: Used to handle asynchronous operations. A Promise object represents the final completion (or failure) of an asynchronous operation and its result value.

• Map, Set, WeakMap, WeakSet: These are new data structures introduced by ES6. Map objects are used to save key-value pairs, and Set objects are used to save unique keys. WeakMap and WeakSet are similar to other collection types, but they can store reflection-inactive objects as key values.

• ArrayBuffer, TypedArray, DataView: These objects are used to process binary data. An ArrayBuffer object represents a general-purpose, fixed-length buffer of raw binary data. The TypedArray object provides a mechanism for reading raw binary data buffers, including types such as Int8Array, Uint8Array, Uint8ClampedArray, Int16Array, Uint16Array, Int32Array, Uint32Array, Float32Array, and Float64Array. The DataView object provides a method to read a buffer of raw binary data, allowing the data type of each byte to be specified (such as unsigned integer, signed integer, IEEE floating point, etc.).

• WebAssembly (Wasm): This is a new binary code format that can run in modern web browsers. Wasm provides an efficient and safe way to compile and execute code, especially in applications that require high performance.

The above are some common built-in objects in JavaScript, but they are not limited to these. As JavaScript evolves and new ECMAScript standards are introduced, more built-in objects and methods may be added.

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