What are built-in objects

#In programming, built-in objects usually refer to objects provided by the language itself with specific functions and properties. These objects are usually part of the programming language and can be used directly in the code without additional import or loading.

For example, in JavaScript, common built-in objects include:

1. Math: objects used to perform mathematical operations, such as rounding, rounding, and trigonometric functions wait.
2. Date: An object used to represent date and time, providing methods for obtaining the current time, formatting output, etc.
3. Array: Object used to operate arrays, including methods for adding, deleting, modifying, and checking arrays.
4. String: Object used to operate strings, providing various processing methods for strings.

In Python, there are also many built-in objects, such as:

1. list: An object used to represent a list, providing many methods for operating on the list.
2. dict: An object used to represent a dictionary, providing methods for operating key-value pairs.
3. set: An object used to represent a collection and provides methods for collection operations.
4. int: An object used to represent integers, providing methods for integer operations.

In general, built-in objects are objects with specific functions and properties provided by the programming language itself, which can be used directly in the code without additional introduction or definition. By using built-in objects, developers can easily perform various operations, and these objects have the same behavior in different programs because they are part of the language.