Create a function, <span style="font-family:serif">compose</span>, whose two arguments <span style="font-family:serif">''f''</span> and <span style="font-family:serif">''g''</span>, are both functions with one argument.
The result of <span style="font-family:serif">compose</span> is to be a function of one argument, (lets call the argument <span style="font-family:serif">''x''</span>), which works like applying function <span style="font-family:serif"> ''f'' </span> to the result of applying function <span style="font-family:serif"> ''g'' </span> to <span style="font-family:serif"> ''x''</span>.
Hint: In some languages, implementing <span style="font-family:serif">compose</span> correctly requires creating a [[wp:Closure (computer science)|closure]].
