Basic data types in YAML

YAML support 3 basic data types.

a.   Scalars: Numbers, Strings, Booleans

b.   Sequences: Arrays, Lists

c.   Mappings: Hashes, Dictionaries

Scalar

Scalar represent the primitives in programming languages. For example, a scalar can be a string, integer, double, boolean.

Example

id: 1
firstName: "Krishna"
lastName: "Gurram"

Sequences

Sequences represent list (or) array of items. Here item can be an object (or) a scalar.

Example

---
- id: 1
  firstName: "Krishna"
  lastName: "Gurram"
- id: 1
  firstName: "Chamu"
  lastName: "KB"

Above example represents list of employee objects.

Mappings

Mappings are used to represent hashes, dictionaries.

Example

A map of employees (where key is the id of the employee and value is the employee object) is represented like below.

---
1:
  id: 1
  firstName: "Krishna"
  lastName: "Gurram"
2:
  id: 1
  firstName: "Chamu"
  lastName: "KB"

Above information is rendered like below in Eclipse.

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