javascript - 如果彼此相邻，则一起加入一周中的几天

Question

我有一个数组，最多可以包含一周中的所有日子

["mon", "tues", "wed", "thur", "fri", "sat", "sun"]

我正在尝试找出一个可以产生以下内容的好脚本

数组包含

["mon", "tues", "fri", "sat", "sun"]

输出一串 Mon-Tues & Fri - Sun

我知道我显然可以用 if 语句做到这一点，但我想不出一个好的/聪明的方法来做到这一点。

Answer 1

const days = ["mon", "tues", "wed", "thur", "fri", "sat", "sun"];

function group(arr){
  let result = [ [] ], current = result [0];

  for(const day of arr){
    if(days.indexOf(current[current.length-1]) + 1 === days.indexOf(day)) {
      current.push(day);
    } else {
     current = [day];
     result.push(current);
   }
  }

  return result
    .filter(el => el.length)
    .map(el => el.length > 1 ? el[0] +"-"+ el.pop() : el[0])
    .join(" & ");
}

In action

上面的代码将数组分组为连续的天组，然后加入它们:

group(["mon", "tues","thur", "fri","sun"])
// [[ "mon","tues"], ["thur","fri"], ["sun"]]
// mon - tues & thur - fri & sun