1. Dart variable

Var XXX =’ SSS ‘String XXX =’ SSS’ var NNN = 123 int NNN = 123 var BBB = true Boolean BBB = true

2. Define const final

Final is a run-time constant, and final is a run-time constant that is initialized at run time

3. Common data types

  • Numbers: int double
  • Strings: String
  • Booleans(Boolean) bool
  • List
  • Maps: key-value pair objects

3.1 You can define a multi-line string ”’ ”’ with three double quotes or three single quotes