Hello, everyone! I am Goutham, and in this blog I would like to explain intermediate YAML syntax. I have already written a blog on the basics of the YAML syntax and its equivalent JSON syntax.

Multiple documents

Using 3 hyphens --- we can write multiple YAML documents in a single file .

---
name: Apple
color:  Red

--- 
name: mang fileo
color: Yellow

...     # 3 dots are used to end YAML without starting new one ...

Anchors and Alias

While writing large YAML files, most of the stuff may repeat, which makes the file large and difficult to understand. What if, just like in programming languages, storing data in variables and using it where ever we want was present in YAML as well?

This is where Alias comes in.

name: Apple 
properties:
 color: red
 cost: 30Rs

name: Tomato
properties:
 color: red
 cost: 30Rs

name: Cherry
properties:
 color: red
 cost: 30Rs

name: Apple 
properties: &store
 color: red
 cost: 30Rs

name: Tomato
properties: *store


name: Cherry
properties: *store

What if we want to manipulate some of the values instead of blind replicating?

name: Apple 
properties: &store
 color: red
 cost: 30Rs

name: Tomato
properties: 
   <<: *store # replicating everything in properties
   cost: 20Rs # value in cost key will be changed now to 20Rs

name: Cherry
properties: 
 <<: *store 
   cost: 40Rs

DataTypes

Datatypes are used when we want to explicitly mention the type of value we want to store.

Integer: !!int 78
Float: !!float 89.98
Nullvalue: !!Null # Here anything among Null,NULL,null, ~  can be used
binary: !!int 0b11 # stores 3 
hexadecimal: !!int 0x11 # stores 17
octal: !!int 011  # stores 9
boolean: !!bool 1 # we can store 0 ,1 ,true,false YAML can convert it.
string: !!str 9 # stores 9 as a string

If we want to use pairs which always occur together then..

apple: !!pairs
  - color: red  ## color,red always occur together

An equivalent JSON would be

{
  "apple": [
    [
      "color",
      "red"
    ]
  ]
}

We can even do this as well.

apple: 
 - 
  - color 
  - red

This also provides the same JSON output.

Thank you so much for reading my blog on YAML2. If you find any mistakes please let me know.

Thank you, Mariusz Michałowski , for helping me to write a blog on YAML.

This is Mariusz article on YAML have a look .

https://spacelift.io/blog/yaml

Have a Great day 🎉🎉🎉.