function composition operator造句

Last time I checked it was the function composition operator.
Haskell standard library, the full stop is the function composition operator.
Perl 6 like Haskell has a built in function composition operator, the main difference is it is spelled as " or o.
which, using the function composition operator ( expressed as a dot in Haskell ) to compose the product function with the point-free style:
It's difficult to find function composition operator in a sentence. 用function composition operator造句挺难的