F# Type and Module Extensions Adding new static functions to existing types
Example
F# allow existing types to be extended with new static functions.
type System.String with
static member EqualsCaseInsensitive (a, b) = String.Equals(a, b, StringComparison.OrdinalIgnoreCase)
This new function can be invoked like this:
let x = String.EqualsCaseInsensitive("abc", "aBc")
// result is True
This feature can mean that rather than having to create "utility" libraries of functions, they can be added to relevant existing types. This can be useful to create more F#-friendly versions of functions that allow features such as currying.
type System.String with
static member AreEqual comparer a b = System.String.Equals(a, b, comparer)
let caseInsensitiveEquals = String.AreEqual StringComparison.OrdinalIgnoreCase
let result = caseInsensitiveEquals "abc" "aBc"
// result is True
