js相同字符串截取拼接

原数据

const list = [
	'999-1234567801',
    '999-1234567802',
	'999-1234567803',
];
const list1 = [
	'999-1234567899',
    '999-1234567900',
	'999-1234567901',
];

期望数据

'999-1234567801/2/3' //list
'999-1234567899/900/901' //list1

处理代码

// 连续号码处理
export const formatNumber = (ticketNo: string[]): string => {
  let point = 0;
  let isTheSame = true;
  const baseStr = ticketNo[0] || '';
  for (let i = 0; i < baseStr.length; i++) {
    const str = baseStr[point];
    isTheSame = !ticketNo.some((t) => t[point] !== str);
    if (isTheSame) {
      point++;
    } else {
      break;
    }
  }
  if (point === baseStr.length) {
    return baseStr;
  } else {
    let msg = '';
    ticketNo.map((t, index) => {
      if (index === 0) {
        msg = t;
      } else {
        msg = msg + `/${t?.substring(point, t?.length)}`;
      }
    });
    return msg;
  }
};