What are built-in objects

Built-in objects are objects predefined in a programming language. These objects usually provide some useful functions and methods to make programming more convenient for developers. In many programming languages ​​there are built-in objects that can be used directly without additional imports or instantiations. Common built-in objects: 1. Math object; 2. Date object; 3. Array object; 4. String object; 5. RegExp object. Different programming languages ​​may also provide other built-in objects to handle file operations and network communications.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Built-in objects are objects predefined in the programming language. They are automatically created and used during program execution. These objects usually provide some useful functions and methods to make programming more convenient for developers.

In many programming languages, such as Java, Python and JavaScript, there are some built-in objects. These objects can be used directly without additional import or instantiation. Some common built-in objects and their functions are introduced below.

Math object: The Math object provides some commonly used mathematical functions and constants, such as calculating square roots, absolute values, logarithms, trigonometric functions, etc. Developers can use these functions directly to perform mathematical operations without having to implement them themselves.

Date object: Date object is used to represent date and time. It provides many methods to get and modify date and time, such as getting the current date and time, setting a specific date and time, calculating the difference between two dates, etc.

Array object: Array object is used to represent and operate arrays. It provides some methods to add, delete, modify elements in the array, and perform operations such as sorting and searching the array. Developers can use these methods directly to work with arrays without having to implement them themselves.

String object: String object is used to represent and operate strings. It provides some methods to get the length of a string, intercept substrings, find substrings, replace substrings, etc. Developers can use these methods directly to process strings without having to implement them themselves.

RegExp object: RegExp object is used for regular expression matching. It provides methods for pattern matching, replacing matched strings, etc. Developers can use regular expressions for powerful string manipulation.

In addition to the above-mentioned built-in objects, different programming languages ​​may also provide other built-in objects, such as file objects, network objects, etc., used to handle functions such as file operations and network communication.

In short, built-in objects are predefined objects in programming languages. They provide some useful functions and methods so that developers can program more conveniently. By using these built-in objects, developers can save a lot of time and effort and improve programming efficiency.

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