Kuba Ciechowski
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Kuba's space

Tuple vs multiple params in F# functions

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Kuba Ciechowski
·Dec 19, 2020·

2 min read

In my mind, the F# code was almost braceless. I enjoyed reading it because it felt so natural.
Recently, I wrote a bit of F# code. And guess what? There were way too many braces for my taste.
Take a look at this code:

let extractNumbers (numbers: Input, delimiterType: DelimiterType)
let numbers = extractNumbers (input, delimiterType)

Braces all over the place! How did it happen? Was my initial feeling wrong?

Not at all. I've used it wrong. I didn't know how to declare a function with multiple params. Instead, I've defined a tuple as an input.
An improved version could look like this:

let extractNumbers (numbers: Input) (delimiterType: DelimiterType)
let numbers = extractNumbers input delimiterType

Can you spot the difference?
I've changed the definition of the function. Instead of a tuple, now it takes two parameters. I've only skipped coma between the params. And now I feel much better about this code.

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