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Uses and Data Types.md

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Where is YAML used?

  • Configuraton files
  • Log files
  • Caches

Benefits of using YAML?

  1. Its very simple and easy to read.
  2. It has a strict syntax. For example: Indentation is important.
  3. Easily convertable to JSON, XML.
  4. Most programming languages have a support for YAML.
  5. More powerful when representing complex data.
  6. Parsing is easy for YAML files.
  • YAML is Case Sensitive.
  • YAML can be a collection of 3 or more documents. use --- to differentiate between different objects.
  • ... used to mark the end of the document.

Variable declaration

  • Example : myself: Shubh Karman Singh fruit: "apple" job: 'swe' All the above declarations can be seen as variable declarations in YAML. We are storing strings here

Note you have to write the whole sentence in one line if you have a large sentence.

Adding a Multi Line variable

bio: Hello this is awesome.
How are you doing

The above example will show an error. In order to preserve new lines and tabs and stuff. Add | in front of the variable declaration.

For Example:

Bio: | 
This is awesome. My name is Shubh Karman Singh. 
I am a programmer

Adding a Multi Line Declaration to single line.

If you want to specify that the words written in multiple lines later are to be considered as a single sentence, use >.

Bio: > 
This is awesome. 
My name is 
Shubh Karman Singh. 
I am 
a 
programmer

Data Types in YAML

YAMLautomatically detects the data type you declared as a value. But we can explicitly specify the data type as well.

number: 3432
marks: 56.33
booleanVal: No # we can also use: n, N, false, False, FALSE. 
#Same for true -> yes, y, Y, True, TRUE
Specifying a type

INT

positiveNum: !!int 45
binNum: !!int 0b11011
octalNum: !!int 034353
Hexadecimal: !!0x3435
commaVal: +540_000 # its same as writing 540,000
exponentialNum: 6.023E56 

# We can also write something like not a number

notANum: .nan

STR/BOOL

boolVal: !!bool No
stringVal: !!str Hello

NULL

Surname: !!null Null # null or NULL or ~

You can also add a data and time in YAML as well. If no timeZone added YAML assumes the time/date added to be UTC.

Date and Time


date: !!timestamp 2002-12-14
indiaTime: 2001-12-15T02:59:43 +5:30