What are non-null basic data types?

In JavaScript, non-null basic data types refer to all basic data types except "null" and "undefined": 1. Strings representing text data types; 2. Including integers and floating point numbers Number; 3. Boolean value representing logical true or false; 4. New symbols added in ES6.

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

In JavaScript, non-null basic data types refer to all basic data types except null and undefined.

1. String: represents the type of text data, for example: "Hello, World!".

2. Numbers: including integers and floating point numbers, for example: 42, 3.14.

3. Boolean value: represents logical truth or falsehood, that is, true or false.

4. Symbol: ES6 new data type, representing unique values.

When we talk about non-null basic data types, it means that the values ​​stored in variables or constants of these data types are not null or undefined. These data types can be stored and transferred directly without additional processing.

It should be noted that although non-null basic data types exclude null and undefined, in some cases, we may treat null and undefined as special "null" values ​​used to represent missing or uninitialized state.

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