How to remove elements from an array so that it is not replaced by null?

Question

Node.js

Hello, removing some element from the array, this element turns into null for me. How can this be fixed?

delete message.user

// -> 

[{ ..., null, ... }]

due to the fact that some element becomes null, the users.find() method stops working.

Answer 1

const arr = [1, 2, 3];
let index = 1; // берем индекс двойки. 
let count = 1; // сколько вырезать элементов

arr.splice( index, count );

console.log( arr ); // [1, 3]

Answer 2

Do not use an array as an object (convert using Object.assign) or Map , in which case the sequence may be broken, and the order of elements by key may not be in order

Answer 3

let res = [ 1, 2, 3];
res.forEach((el, i) => {
  if (el === 2) {
    delete res[i];
  }
})
res = res.filter(Boolean);
console.log(res); // [1, 3]