F# TryGetValue, can't access the value?

Question

I am using TryGetValue on a Dictionary in F# and it returns an object bool * Dictionary<int, object>

I have been googling for hours but how do I access the bool component of this object so I can check if it has returned a value?

Please save me from going postal...

Answer 1

There are a few options.

The simplest is probably:

let found, value = dict.TryGetValue key

Alternatively:

let pair = dict.TryGetValue key
let found = fst pair
let value = snd pair

The most common pattern is this:

match dict.TryGetValue key with
  | true, value -> (* do something with value *)
  | _           -> (* handle the case of value not found *)