过滤[空]数组对象

Question

I'm deleting some array object in traditional way: delete subDirectories[index] . So, just after that this object is changing to [empty] one. Now, how to filter that, undefined, bool, NaN nothing works. I'm working with Vue.js and this contains an vuex action. Can anybody help?

Answer 1

If you want to delete all null, undefined, (or any false-like) values in an array, you can just do:

var arr = [1,3,5, null, False];
var res = arr.filter(val=>val);
console.log(res); // [1,3,5]

Alternatively, you can explicitly remove null and undefined:

var res = arr.filter(val => (val!==undefined) && (val!==null));
console.log(res); // [1,3,5]