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F# Type Annotation

F# allows type annotation. By using type annotation you can explicitly mention the type of identifier, parameter, return value of a function. You must use: (colon) to apply annotation in F#.

Let's see where and how we can apply type annotation.

  • Type annotation in variable (identifier)
  • Type annotation in function parameter and return type

F# Type Annotation in variable (identifier) Example

Here, we are explicitly mentioning type of variable followed by: (colon).



F# Type Annotation in Function Example

Here, we are using type annotation in parameters and return value.


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