Function that checks if something is a function, YO DAWG

checkFunction.js

/**
 * isFunction - Function that check if a something is a function, yo dawg
 *
 * @param  {...*} functionToCheck function to check without the parens ()
 * @return {boolean}
 */
function isFunction( functionToCheck ) {
  var getType = {};
  return functionToCheck && getType.toString.call( functionToCheck ) === '[object Function]';
}