/* Totally minimal "typed functions" */

const addImps = (dest, imps) => {
   if (imps) {
      if (!Array.isArray(imps[0])) imps = [imps]
      for (const imp of imps) dest.push(imp)
   }
}

export default function poortf (name, imps) {
   /* This is the (function) object we will return */
   function fn () {
      for (const imp of fn.imps) {
         if (imp[0](arguments)) return imp[1].apply(null, arguments)
      }
      throw new TypeError(
         `TF ${fn.name}: No match for ${arguments[0]}, ${arguments[1]}, ...`)
   }

   /* Now dress it up for use */
   Object.defineProperty(fn, 'name', {value: name})
   fn.imps = []
   addImps(fn.imps, imps)
   fn.addImps = newI => addImps(fn.imps, newI)

   return fn
}