Print prototype stack

print-stack.js

function pps (obj) {
  let count = 1
  while (obj) {
    const okeys = Object.keys(obj)
    const str = okeys.length > 0 ?
      `[${okeys.join(', ')}]` : `[${obj.constructor.name}]`
    console.log(`[${count++}]: ${str}`)
    obj = Object.getPrototypeOf(obj)
  }
}