F# if not condition

What is the best way in F# to write an if not condition?

Right now I'm writing it like this:

if condition <> true then do
开发者_Python百科

Is there any other shorter way to write it? Like using the ! operator?

if you consider that not is also a function, then you can pipe your condition into it to avoid parenthesis like so:

if not <| condition param1 param2 then ...

reason being is if your condition function takes arguments, you don't need to do

not (condition param1 param2) 

it's probably a little cleaner to do it the first way since it seems f# is in favor of pipes instead of parenthesis for operator precedence.

In Ocaml, you can use the "not" keyword:

if not condition then ...

Hopefully works too with F#.

There is the not function, but it only works with boolean variables.

So you can say:

if (not condition) then do

But that would not work with other types as in C-style languages.

Do not use ! by accident, as it is still an operator in F#, it is a dereference on a mutable reference cell.

See the full operator documentation.

I don't know F# but in C, using the ! operator I'd write:

if(!condition) { ... }

which is the same as

if(condition == false) { ... }