1. What is YAML ?

• The full form of YAML is Yet another markup language or YAML ain't markup language.

• It is not a Programming language.

• It use to data format exchange data similar to XML and JSON.

• In YAML, you can store only data rather than commands.

2. Data Serialisation Language.

YAML, JSON, XML

• Object to file-> Serialisation.

• File to object-> Deserialisation.

3. Where is uses of YAML?

• Configration file-> Docker/Kubernetes, logs, cache etc

4. Benefit of YAML.

• Simple and easy to read

• It has a nice syntax (Indentation is Important in YAML)

• Easily convertible to JSON, XML

• More powerful when representing complex data

• things to remember while writing YAML

• YAML is a case-sensitive language, if we create a list or other things we stored data like this "apple" and "Apple" they both have different means in YAML.

---
- apple
- mango
- banana
- Apple

• For comments in YAML, we use # like as follows

#this is comment

5. Start here:

• Open you code editor whatever you like and create a YAML file with extension like .yaml or .yml both works fine. I like .yaml

hello.yaml

6. List or Array represent in YAML.

---
fruits
- apple
- mango
- banana
- Apple

• So given above example contains list of fruits and you can create list like this in YAML.

• (---) is use for separate the documents and (...) is use for end of document.

7. Datatype in YAML.

• string variable.

myself: Shivam Sharma
fruits:  apple
Job: Swe
bio: Hey, I am Shivam

• So in above example we have seen that how we can store string in YAML. Our next is numbers, How we can store number in YAML?

• Numbers variable.

number: 5651334
marks: 70.8
boolean: false

• In the YAML we can also specify the type of data, like int, float, boolean and so many others also.

• Let's suppose we want to store 0 and some other numbers, so here we will be looking at some of the examples as follows.

8. Specify the types of data.

• So this is, that how we can specify the datatype in YAML and while reading this topic be attentive.

zero: !!int 0
possitivenumber: !!int 50
negativenumber: !!int -50

• So you can store numbers as per your requirement like the above example, now we are going to see floating point numbers.

marks: !!float 70.46
rates: !!float 5.2
CGPA: !!float 8.34

• So, now we are going to see how we can store string in YAML.

messege: !!str I am Shivam and i love to write codes
Quotes: !!str Die with memories not the dreams

• How we can store null in YAML? Let's look at this.

surname: !! null null

9. Date and Time in YAML.

 date (00:00:00Z): 20021-4-25
startTime: 2022-4-08T00:00:00

10. Advance data Type in YAML.

• We have already familiar about list, if you don't know so first read point 6 then come here.

• Let's suppose we want to store a sequence list of student data as following.

student: !!seq
- marks
- name
- roll_no

• It can be written the same as follows. Both work fine.

student: !!seq [marks, name, roll_no]

• Empty sparse sequence. mean when you don't want to add data or value to something. you can see the following YAML code.

sparse seq:
- hey
- how
- 
- null
- sup

• Nested sequence example.

 --- 
- ~
- mango
- banana
- apple
- ~
- marks
- roll_no

11. Pair key may have duplicate values.

pair example: !!pairs
- job:Student
- job:teacher
- job:YouTube

• We can also write same as following.

pair example: !!pairs [job: Student, job:teacher, job:YouTuber]

***For more watch this video. ***