1. Introduction
2. Getting Started
3. 1. Install
   2. Playground
   3. Example
4. Reference
5. 1. CLI
   2. Values and Types
   3. Conditionals and Comparisons
   4. 1. Conditionals
      2. Comparisons
   5. Syntax
   6. 1. Pipe Operator
      2. ? Operator
      3. Environment variables
      4. Def Expression
      5. Let Expression
      6. If Expression
      7. While Expression
      8. Until Expression
      9. Foreach Expression
      10. Comments
      11. Include
      12. Self
      13. String Interpolation
   7. Builtin selectors and functions
   8. 1. Builtin functions
      2. Builtin selectors