function namesOfWeekdays() {
  return Array.from(Array(7), (_, i) =>
    new Date(0, i).toLocaleDateString("en", { weekday: "long" }),
  )
}

function namesOfMonths() {
  return Array.from(Array(12), (_, i) =>
    new Date(0, i).toLocaleDateString("en", { month: "long" }),
  )
}

function $(selector, parent = document) {
  const node = parent.querySelector(selector)
  node.on = (name, fn) => {
    node.addEventListener(name, fn)
  }
  return node
}

function $$(selector, parent = document) {
  const nodeList = Array.from(parent.querySelectorAll(selector))
  nodeList.on = (name, fn) => {
    for (const node of nodeList) {
      node.addEventListener(name, fn)
    }
  }
  return nodeList
}

function deduplicate(array) {
  return [...new Set(array)]
}

function randomColor() {
  return "#" + Math.floor(Math.random() * 256 ** 3 - 1).toString(16)
}

function* range(from, to) {
  if (typeof from === "number") {
    if (to >= from) {
      for (let i = from; i <= to; i++) {
        yield i
      }
    } else {
      for (let i = from; i >= to; i--) {
        yield i
      }
    }
  } else if (typeof from === "string") {
    if (to >= from) {
      for (let i = from.charCodeAt(0); i <= to.charCodeAt(0); i++) {
        yield String.fromCharCode(i)
      }
    } else {
      for (let i = from.charCodeAt(0); i >= to.charCodeAt(0); i--) {
        yield String.fromCharCode(i)
      }
    }
  }
}