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?
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]
delete you have a value in the array called empty. If the value is empty the function in filter isn't called so you can do this: arr.filter(x=>true); Try this in console:arr = [1,2,3];delete arr[1];arr.filter(x=>true);
empty x 10) when doing new Array(10)` Map isn't called when you do: new Array(10).map(_=>console.log("hi")) It's also not called when you delete: var arr = [1,2,3];delete arr[0];arr.map(x=>{ console.log(x);return x; }) but the array returned still has a length of 3 and the empty item is still there. I try to avoid delete and use new Array like this: Array.from(new Array(10),(x,index)=>index)