SOURCE

const isType = type => target => `[object ${type}]` === Object.prototype.toString.call(target)
const isArray = isType('Array')
const isObject = isType('Object')
console.log(isArray(['1', '2']))
console.log(isObject({}))

function typeVerification (target) {
  const ret = typeof target
  console.log(ret)

  const template = {
    '[object Number]' : 'number - object',
    '[object String]' : 'string - object',
    '[object Boolean]': 'boolean - object',
    '[object Object]' : 'object',
    '[object Array]'  : 'array'
  }

  if (target === null) {
    return null
  }

  if (ret === 'object') {
    const str = Object.prototype.toString.call(target)
    return template[str]
  }
  
  return ret
}

console.log(typeVerification(null))