Recommend 10 practical tutorials on built-in types

I plan to review JavaScript from the basics. By the way, I will share and summarize the knowledge I have learned. Built-in types There are seven built-in types in JavaScript, including six basic types and one reference type. The basic type number (number) string (string) boolean (Boolean value) undefined (undefined) null (null value) symbol (symbol) [ES6 specification new] reference type object (object) Note: array array and function function are special objects, that is to say, they are objects "Subtype" is also a reference value. The basic type is a simple data segment stored in the stack memory. There is a fixed space in the memory. The reference type is an object stored in the heap memory. It is accessed by reference. The stack memory stores the pointing object. The pointer (which stores the access address of the object) is divided into stacks in the memory because it is related to the browser's garbage collection mechanism to ensure that the minimum memory occupied during runtime is okay. If you don't understand the above, it doesn't matter. As long as you know that the basic type is a stack Data and reference types can be heap data. The typeof operator can also be said to be a typeof operator.

1. Seven value types and typeof operators in JavaScript

Introduction: I plan to review JavaScript from the basics. By the way, I will share and summarize what I have learned. Built-in types There are seven built-in types in JavaScript, including six basic types and one basic reference type. Type number (number) string (string) boolean (Boolean value) undefined (undefined) null (null value) symbol (symbol) [ES6 specification new] reference type object (object) where the basic type is stored in stack memory The simple data segment has

2 in memory. Crazy XML study notes (9)-------------Schema built-in type

Introduction: 1. The project address https://github.com/eclipse/buildship can be used to download the project directly Then install eclipse locally, or you can follow the following method 2. Eclipse online installation (1) Online installation address guide: https://github.com/eclipse/buildship/blob/master/docs/user/Installation.md The full text is as follows: E

3. python study notes-magic method to make custom classes more like built-in types

Introduction: Python The magic methods are those predefined functions in Python like __XXX__ type. The biggest advantage of using Python's magic methods is that Python provides simple ways to make objects behave like built-in types. __str__ function The __str__ function is used to handle printing the instance itself...

4. Python magic method: Make custom classes more like built-in types

Introduction: Python’s magic methods are those predefined functions of type __XXX__ in Python.

5. java built-in data types

Introduction: A constant is an amount that will not be modified when the program is running. ​Use the final keyword in Java to modify constants. The declaration method is similar to that of variables: ​finaldouble PI =3.1415927; ​Although constant names can also be in lowercase, for ease of identification, capital letters are usually used to represent constants. Literals can be assigned to variables of any built-in type. For example: byte a =68; char a ='A' byte, int, long, and short...

6. For clob type in Java + Oracle environment Insertion of data

#Introduction: The mapping relationship of SQL type CLOB in the JavaTM programming language. SQL CLOB is a built-in type that stores Character Large Object as a row in a database table

7. CLOB, BLOB and NLOB in Oracle

Introduction: The mapping relationship of SQL type CLOB in the Java TM programming language. SQL CLOB is a built-in type that stores a Character Large Object as a column in a row of a database table. By default, the driver implements Clob objects using SQL locator(CLOB), which means that the CLOB object contains a pointer to the SQL CLOB data instead of

8. javascript from() Method to convert an array-like object into a real array

#Introduction: With the arrival of Class syntax in ES6, we can create new subclasses for any built-in type (such as Array) Class (for example, called SubArray), these subclasses will also inherit the static methods of the parent class, such as SubArray.from(). After calling this method, an instance of the subclass SubArray will be returned instead of an instance of Array.

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