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FScript

Primitive Types

Draft 0.1 recommends these canonical built-in names:

  • Number
  • String
  • Boolean
  • Null
  • Undefined
  • Never
  • Unknown

Example values

count = 10
name = 'Ada'
active = true
empty = Null
missing = Undefined

Important rules

  • there is no implicit coercion between primitive types
  • Null is not assignable to everything by default
  • Undefined is not assignable to everything by default

Comparison to JavaScript

JavaScript performs many implicit coercions. FScript does not. That makes programs more predictable and keeps the type system easier to trust.