Delete an item from array at a specific index

Let's assume that we have the following array that and we want to delete the fifth item:

javascript
let numbers = [1, 2, 3, 4, 67, 5, 6, 7];

We can slice the array in two parts and then use the spread operator ... to put everything together again:

javascript
// We are slicing the array in two parts: 0 - 4 and 5 - End
let first  = numbers.slice(0, 4);
let second = numbers.slice(5);

// As we are not including the 
let completed = [...first, ...second];
// [1, 2, 3, 4, 5, 6, 7]

In one line of code:

javascript
let completed = [...numbers.slice(0, 4), ...numbers.slice(5)];
// [1, 2, 3, 4, 5, 6, 7]