functionName

Logs the name of a function.

• Use console.debug() and the name property of the passed function to log the function's name to the debug channel of the console.
• Return the given function fn.

const functionName = fn => (console.debug(fn.name), fn);

let m = functionName(Math.max)(5, 6);
// max (logged in debug channel of console)
// m = 6