Yaml language-01 (data type, array, object)

YAML It's a similar XML、JSON The Markedness of language . It emphasizes data Centered , It's not about logo language . thus YAML The definition itself is relatively simple , It's called " A humanized data format language ".

<heima>
    <age>15</age>
    <address>Beijing</address>
</heima>
heima:
  age: 15
  address: Beijing

YAML Its grammar is relatively simple , There are mainly the following ：

• Case sensitive
• Use indentation to indicate hierarchy
• Indenting is not allowed tab, Only spaces are allowed ( Low version limit )
• The number of indented spaces doesn't matter , Just align the elements at the same level to the left
• '#' Notation

YAML The following data types are supported ：

• Pure quantity ： A single 、 Nonseparable value
• object ： Set of key value pairs , Also known as mapping （mapping）/ Hash （hash） / Dictionaries （dictionary）
• Array ： A set of values in order , Also called sequence （sequence） / list （list）

#  Pure quantity ,  It means a simple value , character string 、 Boolean value 、 Integers 、 Floating point numbers 、Null、 Time 、 date 
# 1  Boolean type 
c1: true ( perhaps True)
# 2  integer 
c2: 234
# 3  floating-point 
c3: 3.14
# 4 null type  
c4: ~  #  Use ~ Express null
# 5  The date type 
c5: 2018-02-17    #  Date must use ISO 8601 Format , namely yyyy-MM-dd
# 6  Time type 
c6: 2018-02-17T15:02:31+08:00  #  Time use ISO 8601 Format , Use... Between time and date T Connect , Finally using + Represents the time zone 
# 7  String type 
c7: heima     #  Simple writing , Write the value directly  ,  If there are special characters in the middle of the string , You must use double quotation marks or single quotation marks to wrap  
c8: line1
    line2     #  If there are too many strings, you can split them into multiple lines , Each line is converted to a space 
#  object 
#  Form 1 ( recommend ):
heima:
  age: 15
  address: Beijing
#  Form 2 ( understand ):
heima: {
    age: 15,address: Beijing}
#  Array 
#  Form 1 ( recommend ):
address:
  -  Shunyi 
  -  Changping   
#  Form 2 ( understand ):
address: [ Shunyi , Changping ]

tip ：

1 Writing yaml Bear in mind : Add a space after it

2 If necessary, multi segment yaml Put the configuration in a file , Use in the middle --- Separate

3 Here's a yaml turn json Website , It can be used to verify yaml Whether the writing is correct

https://www.json2yaml.com/convert-yaml-to-json