Why is splice affecting arr2 argument?

JavaScript
1

Hey guys,

I am assigning the splice method to result but for some reason arr2 is still being affected.

function frankenSplice(arr1, arr2, n) {
    let result = arr2;
  
    for (let i = arr1.length - 1; i >= 0; i--) {
        result.splice(n, 0, arr1[i]);
    }
    console.log(arr2);
    return result;
}
console.log(frankenSplice(["claw", "tentacle"], ["head", "shoulders", "knees", "toes"], 2));

Output:
[ ‘head’, ‘shoulders’, ‘claw’, ‘tentacle’, ‘knees’, ‘toes’ ]
[ ‘head’, ‘shoulders’, ‘claw’, ‘tentacle’, ‘knees’, ‘toes’ ]

2

this is not making a copy, this is creating a new reference to the same array, so if you edit result, arr2 is also affected

remember ways to copy arrays!

1 Like
3

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