Array changed after assign to variable

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question:

You are given two arrays and an index.

Copy each element of the first array into the second array, in order.

Begin inserting elements at index n of the second array.

Return the resulting array. The input arrays should remain the same after the function runs.

my code is:

JavaScript

<pre>unction frankenSplice(arr1, arr2, n) {
 let newarr = arr2;
  
  newarr.splice(n,0,...arr1);

  console.log(arr2);
  console.log(newarr)
  
  return newarr;
}

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

What I have tried:

I would like arr2 keep the same, but after assign to newarr, arr2 got same values newarr has.

Posted 16-Jan-24 4:31am

nonprocoder

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M Imran Ansari · Accepted Answer · 2024-01-16T06:21:00

There's a small mistake in your code. The splice method modifies the array in place and returns an array containing the deleted elements. You need to insert one array into another, so all you need is a single splice. Here is the modified version of code:

JavaScript

function frankenSplice(arr1, arr2, n) {
  
  // Create a shallow copy of arr2 to avoid modifying it directly
  let newarr = arr2.slice();
  
  newarr.splice(n, 0, ...arr1);

  console.log(arr2);
  console.log(newarr);

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

Reference: https://stackoverflow.com/questions/58209968/how-to-use-splice-and-slice-to-put-an-array-into-another-array[^]