84669 person learning
152542 person learning
20005 person learning
5487 person learning
7821 person learning
359900 person learning
3350 person learning
180660 person learning
48569 person learning
18603 person learning
40936 person learning
1549 person learning
1183 person learning
32909 person learning
Object.prototype.toString.call(val) == '[object Array]' ? val.some(e => e != undefined && e != null && e != '') : false;
val is the array after the splice(0, 1) operation. I want val.some to return in the situation shown below. false
val
splice(0, 1)
val.some
in the situation shown below. false
Array.prototype.some 会跳过值为 undefined 的元素
Array.prototype.some
如果需要考虑 undefined 就要写 for 循环来遍历了。
的确some的话，不会执行回调方法。
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Array.prototype.some会跳过值为 undefined 的元素如果需要考虑 undefined 就要写 for 循环来遍历了。
的确some的话，不会执行回调方法。