A higher$-$order function, or functional form, is one that either takes one or more functions as parameters or yields a function as its result, or both. One common kind of functional form is function composition, which has two functional parameters and yields a function whose value is the first actual parameter function applied to the result of the second. Function composition is written as an expression, using $\backslash$deg as an operator, as in

haf$\backslash$deg g

For example, if

fix$)=$ X $+2$ g$($x$)=3*\backslash$times

then h is defined as

h$($x$)=$ f$($g$($x$)),$ or h$($x$)=(3*\backslash$times $)+2$

Using the Scala language

implement h $=$f$\backslash$deg g as defined above.