Array.prototype.uniq = function() {
  return [...new Set(this)]
}

Array.prototype.asyncMap = async function(func) {
  const data = []

  for (let item of this) {
    data.push(await func(item))
  }

  return data
}

Array.prototype._concat = function() {
  return this.reduce((prev, next) => prev.concat(next), [])
}