JS Data classification

Data classification of JS

Differences between raw data types and reference data types

Raw data type

1, simple data segment

2, stored value (stack)

Reference Data Type  

1, There are multiple values that make up an object

2, store the address (heap)

6 Types of raw data type or basic data type
1,null (empty, not present)
2,undefined (1, Declaration unassigned, 2, function has no return value)
3,number (Numbers, decimals, and integers)
4,boolean (boolean value, True,false)
5,string (string, single or double-cited)
The 6,ES6 symbol primitive data type produces a unique value through the symbol (), which can be used to transmit the parameter symbol (' DD '), the String class, which does not affect its value, as a property value

Reference data type or complex data type
The 1,object object object is an unordered set of properties, where the "properties" can be basic values, objects, or functions
2,array Array
3,function function

4,object is the parent of all reference types

Detection data type
typeof

JS Data classification