Implement the Slice and Splice Algorithm - Implement the Slice and Splice Algorithm

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This is the code I have created. Do the experts have any advice on my code so that I improve..

Your code so far

function frankenSplice(arr1, arr2, index){
  const newArr = [];
  let i = 0;
  let fake2 = [...arr2];  
  for(; i < index; i++){
  }
  let fake1 = arr2.slice(0,i);
  newArr.unshift(...fake1); 
  newArr.push(...arr1)
  fake2.splice(0,i);
  newArr.push(...fake2);
  console.log(newArr);
  return newArr  
}

frankenSplice([1,2,3], [4,5], 1)
frankenSplice([1, 2], ["a", "b"], 1);
frankenSplice(["claw", "tentacle"], ["head", "shoulders", "knees", "toes"], 2)

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Challenge Information:

Implement the Slice and Splice Algorithm - Implement the Slice and Splice Algorithm

2

what is this loop doing?