问题
样例输入：strs = [‘abcdef’, ‘abdefw’, ‘abc’]
输出：‘ab’，若没有找到公共前缀则输出空字符串
const findCommonPrefix = arr => {
let str = '';
const n = arr.map(item => item.length).sort()[0];
for (let i = 0; i < n; i++) {
str += arr[0][i];
if (arr.some(item => !item.startsWith(str)) {
return str.slice(0, str.length - 1);
}
}
return str;
}