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Fuzion • Idioms • Idiom # 94: Print type of variable

Idiom # 94: Print type of variable

See programming-idioms.org:

Code

type_of x

x.dynamic_type

# For value instances `x`, this is equal to `type_of x`, but for `x`
# with a  `ref` type `x.dynamic_type` gives the actual runtime type,
# while `type_of x` results in the static compile-time type.

What are effects?

Running Example

ex94 =>

  x := "a string"
  y String := ref : String
                redef utf8 => x.utf8

  say (type_of x)
  say (type_of y)

  # or

  say (x.dynamic_type)
  say (y.dynamic_type)

  # For value instances `x`, this is equal to `type_of x`, but for `x`
  # with a  `ref` type `x.dynamic_type` gives the actual runtime type,
  # while `type_of x` results in the static compile-time type.

What are effects?

last changed: 2024-07-01

next: Idiom # 95: Get file size