一连串的星期[星期一，星期三，清华，星期五，太阳]显示在字符串中，如星期一，星期五，太阳。

Question

一个星期数[Mon,Wed,Thu,Fri,Sun]数组，并使用TS或JS以字符串形式显示它，如Mon,Wed-Fri,sun。

接下来的一天会像韦德-弗里一样。

ex-1  [Mon,Tue,Wed,Thu,Fri,sat,sun] display like Mon-Sun
ex-2  [Mon,Tue,Thu,Fri,Sat,sun] display like Mon-Tue,Thu-sun
ex-2  [Mon,Tue,Thu,Sat,Sun] display like Mon-Tue,Thu,sat-sun

Answer 1

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const fullList = ['Mon','Tue','Wed','Thu','Fri','Sat','Sun']
function optimizeList(list) {
  var from = -1, to = -1, res = [];
  fullList.forEach(function(n, idx) {
    var found = list.indexOf(n) >= 0;
    if (found && to >= 0 && idx === to + 1)
      to = idx;
    if (from === -1 && found)
      from = to = idx;
    if (to >= 0 && (idx === fullList.length - 1 || to !== idx)) {
      res.push(fullList[from] + (to !== from ? '-' + fullList[to] : ''));
      from = to = -1;
    }
  })
  return res
}

console.log(optimizeList(['Mon','Tue','Fri','Sun']))
console.log(optimizeList(['Tue','Fri']))
console.log(optimizeList(['Mon','Tue','Wed','Thu','Fri','Sat','Sun']))
console.log(optimizeList(['Sat','Sun']))
console.log(optimizeList(['Tue','Wed']))

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