Splice() and spread operator (...)

JavaScript
1

Hello,
Is it possible to use spread operator (…) with splice() ?
Exemple:
If I want add an arr1 in other arr2 from his index “n”:

let result = arr2.splice(n, 0, ...arr1);

Is it possible or not ?

2

Seems like it might be possible. What happens if you try it?

3

They don’t talk about … (spread).
furthermore they give as example only arrays with strings inside.

But that’s works now.
This my solution:

function frankenSplice(arr1, arr2, n) {
  let copyArr2 = arr2.slice(0);
  copyArr2.splice(n, 0, ...arr1);
  return copyArr2;
}

frankenSplice([1, 2, 3], [4, 5, 6], 1);

I made the same mistake like in this other topic.
https://forum.freecodecamp.org/t/title-case-a-sentence-cascading-methodes/476760/3
I’m still really not well understand with that.

If I write this code, that not works but why ?

function frankenSplice(arr1, arr2, n) {
  let copyArr2 = arr2.slice(0);
  let result = copyArr2.splice(n, 0, ...arr1);
  return result;
}

frankenSplice([1, 2, 3], [4, 5, 6], 1);
4

Hiiii actually I think I just understood

5

An array is an array. There is nothing special about arrays of strings vs arrays of numbers.

Spread syntax ( ... ) allows an iterable such as an array expression or string to be expanded in places where zero or more arguments (for function calls) … are expected

So I would expect spread to work fine in turning an array into a number of optional arguments for the splice() function call.

6

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