CODEWITHSUNDEEP
f#
Oenotria
Oenotria

Reputation: 1702

How to use F# exponentiation operator (**) in prefix notation?

With most operators in F# I can use prefix or infix notation, for example:

let x = a + b

is equivalent to

let x = (+) a b

This does not work for the exponentation operator ** however, because the parenthesised version is treated as a comment. That is, (*this is a comment*) is F# syntax for a comment, so (**) is treated as an empty comment.

let x = a ** b   // a raised to b

let x = (**) a b // empty comment, followed by function a applied to b

Is there an escape character I can use or is this simply a strange quirk of the language?

Upvotes: 10

Views: 1013

Answers (1)

William Barbosa
William Barbosa

Reputation: 4995

Try using spaces between the parentheses, as pointed by kvb in the comments:

let x = ( ** ) a b

Upvotes: 7

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