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F# Tip Of The Week (Week of August 12, 2013) « Onor.io
source link: https://onor.io/2013/08/12/f-tip-of-the-week/
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F# Tip Of The Week (Week of August 12, 2013)
The F# developer can use pattern matching syntax pretty much anywhere in F#. For example, consider the following list:
let l = [1..25]If I want to get the last element of the list, I can do this with a little trivial pattern match:
let lastElem::_ = l |> List.rev;;stdin(7,5): warning FS0025: Incomplete pattern matches on this expression. For example, the value '[]' may indicate a case not covered by the pattern(s).val lastElem : int = 25In this case, you can safely ignore the warning.
You can also pull one of the elements from a tuple very easily with this pattern match:
let name,_ = (“Onorio”,”11W”);;val name : string = "Onorio"The underscore character in both of these pattern matches functions as a wildcard. In both cases it signifies a value that we don’t care about.
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