Note: information on this page refers to Ceylon 1.2, not to the current release.

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Type inference

Local declarations can often let the compiler infer the type.

Usage 

value i = 1;      // infers Integer i
value b = true;   // infers Boolean
value tuple = ["", 1] // infers [String, Integer]
function f() => 1 // infers Integer()

Description

You use the function keyword to infer a function's type, and value to infer a value's type.

Because Ceylon's type system is based on principal types there is only one type the compiler can infer.

Limitations

Type inference cannot be used in all circumstances. It cannot be used:

  • on shared or formal declarations
  • when the value is specified after it's declared
  • to declare a parameter