wicharek

const getAllClassMethods = (obj) => {
  let keys = []
  let topObject = obj

  const onlyOriginalMethods = (p, i, arr) =>
    typeof topObject[p] === 'function' &&  // only the methods
    p !== 'constructor' && // not the constructor
    (i === 0 || p !== arr[i - 1]) && // not overriding in this prototype
    keys.indexOf(p) === -1 // not overridden in a child